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F/PSUtxt1
This website contains an archive of files for the Acorn Electron, BBC Micro, Acorn Archimedes, Commodore 16 and Commodore 64 computers, which Dominic Ford has rescued from his private collection of floppy disks and cassettes.
Some of these files were originally commercial releases in the 1980s and 1990s, but they are now widely available online. I assume that copyright over them is no longer being asserted. If you own the copyright and would like files to be removed, please contact me.
| Tape/disk: | Home » Personal collection » Acorn ADFS disks » Electron_User_Group » EUG_26.ADF |
| Filename: | F/PSUtxt1 |
| Read OK: | ✔ |
| File size: | 1220 bytes |
| Load address: | 50206576 |
| Exec address: | 78745553 |
File contents
Disc drive power supply. For a power supply to be properly effective it needs to be able to supply enough current to whatever is connected to it. It can be capable to supplying much more but this supply will be connected to only one piece of equipment so we don't need to be too generous. A power supply has two stages, the reduction stage where the mains voltage is reduced to a much lower level and a smoothing stage where the mains AC is converted to a smooth DC needed for the drive. The transformer. Much has been said over the years about the potential dangers of mains voltage. As an electrician and as someone with medical qualifications I am perhaps better placed than most to understand these dangers. It has been at least 8 years since I got a shock from the mains, a bolt as electricians call it. I avoid it because I know the risks and I am careful. I always check my connections before I connect to the mains. I test connections with a suitable checking device before I touch them. My connections are always tidy with no dirt or bits of wire hanging around. I never say, that will do for now while I check it. I always make sure that every connection is safe before I leave it. And, I never trust anyone to disconnect the mains for me, if someone does, I check that it is really disconnected before proceding. Suitable checking devices include a good volt meter set at 240V AC or as near as. This will be what most people have. Electricians have volt probes but I don't expect most people to have these. Neon screwdrivers are not suitable, they are dangerous, unreliable and useless. I know some electricians use them but that doesn't make them right. When you use a neon screwdriver the metal tip touches the mains which travels up through a very delicate neon indicator, through the metal tip, up your arm, through your heart, lungs, liver, stomach, intestines, kidneys, your privates, down your legs and into ground. You may not feel it but that doesn't mean it's safe. Added to this is the very real potential for falure of the neon's resistance and zap... I wrote a description of what actually happens when you get electrocuted but after reading it through I decided it was too gruesom. Suffice to say that electrocution is not a quick death, it is slow and very painful. You may have had a few bolts and so far got away with it. You have just been lucky. There is no method of protecting yourself from a mains shock, quick reactions are of no use since your nerve endings will be frozen. The only effective method is not to let it happen at all. These neons aren't even very good for screws since the tips tend to break. There is a way to make them safe however, Place the neon screw driver on a hard surface, take a large hammer, raise it about 2 feet above and bring it down onto the handle with some force. Finally sweep up the remains with a dustpan and put it in the bin. Buying a transformer. Maplin sell a suitable transformer code WB25C for `9.50. It has 2 12V outputs and is rated at 25VA so each 12V line can produce 1A. A cheaper one could probably be had from a local electronics store if you know of one. Next you need a suitable case. The case should be large enough to take the transformer and have about 3 inches x 3 inches left for the circuit board. Ideally the case should be made of metal, pressed aluminium cases are widely available and quite cheap. It must of course have a lid. The first rule is to put your transformer into a suitable case, make sure your connections are good and make sure that the cable is adequatly protected as it leaves the case both from damage from the edges of the case and from being pulled and perhaps comming loose. A strain relief grommet will do this quite well. The cable wil need to be 3 core and capable of carrying 3A so chose a grommet for this size of cable. The hole for one of these grommets has to be a rather odd shape, not round. However I have found that if you drill a round hole and push the grommet from the inside of the case out it will be good and strong. board which will be the second stage. The circuit itself should be built onto vero strip board. Careful soldering is needed. The cable going out to the low voltage power plug could be the same as the mains cable. A strain relief grommet can be used again to protect it. Check all connections and joints and when you have finished check the voltage output in each line before you connect to your drive. These drives don't like the wrong voltage being connected and once your drive is broken you really need to throw it away. Repairers are difficult to find and expensive.
00000000 44 69 73 63 20 64 72 69 76 65 20 70 6f 77 65 72 |Disc drive power| 00000010 20 73 75 70 70 6c 79 2e 0d 0d 46 6f 72 20 61 20 | supply...For a | 00000020 70 6f 77 65 72 20 73 75 70 70 6c 79 20 74 6f 20 |power supply to | 00000030 62 65 20 70 72 6f 70 65 72 6c 79 20 65 66 66 65 |be properly effe| 00000040 63 74 69 76 65 20 69 74 20 6e 65 65 64 73 20 74 |ctive it needs t| 00000050 6f 20 62 65 20 61 62 6c 65 20 74 6f 20 73 75 70 |o be able to sup| 00000060 70 6c 79 0d 65 6e 6f 75 67 68 20 63 75 72 72 65 |ply.enough curre| 00000070 6e 74 20 74 6f 20 77 68 61 74 65 76 65 72 20 69 |nt to whatever i| 00000080 73 20 63 6f 6e 6e 65 63 74 65 64 20 74 6f 20 69 |s connected to i| 00000090 74 2e 20 49 74 20 63 61 6e 20 62 65 20 63 61 70 |t. It can be cap| 000000a0 61 62 6c 65 20 74 6f 0d 73 75 70 70 6c 79 69 6e |able to.supplyin| 000000b0 67 20 6d 75 63 68 20 6d 6f 72 65 20 62 75 74 20 |g much more but | 000000c0 74 68 69 73 20 73 75 70 70 6c 79 20 77 69 6c 6c |this supply will| 000000d0 20 62 65 20 63 6f 6e 6e 65 63 74 65 64 20 74 6f | be connected to| 000000e0 20 6f 6e 6c 79 20 6f 6e 65 20 70 69 65 63 65 20 | only one piece | 000000f0 6f 66 0d 65 71 75 69 70 6d 65 6e 74 20 73 6f 20 |of.equipment so | 00000100 77 65 20 64 6f 6e 27 74 20 6e 65 65 64 20 74 6f |we don't need to| 00000110 20 62 65 20 74 6f 6f 20 67 65 6e 65 72 6f 75 73 | be too generous| 00000120 2e 0d 0d 41 20 70 6f 77 65 72 20 73 75 70 70 6c |...A power suppl| 00000130 79 20 68 61 73 20 74 77 6f 20 73 74 61 67 65 73 |y has two stages| 00000140 2c 20 74 68 65 20 72 65 64 75 63 74 69 6f 6e 20 |, the reduction | 00000150 73 74 61 67 65 20 77 68 65 72 65 20 74 68 65 20 |stage where the | 00000160 6d 61 69 6e 73 20 76 6f 6c 74 61 67 65 0d 69 73 |mains voltage.is| 00000170 20 72 65 64 75 63 65 64 20 74 6f 20 61 20 6d 75 | reduced to a mu| 00000180 63 68 20 6c 6f 77 65 72 20 6c 65 76 65 6c 20 61 |ch lower level a| 00000190 6e 64 20 61 20 73 6d 6f 6f 74 68 69 6e 67 20 73 |nd a smoothing s| 000001a0 74 61 67 65 20 77 68 65 72 65 20 74 68 65 20 6d |tage where the m| 000001b0 61 69 6e 73 20 41 43 0d 69 73 20 63 6f 6e 76 65 |ains AC.is conve| 000001c0 72 74 65 64 20 74 6f 20 61 20 73 6d 6f 6f 74 68 |rted to a smooth| 000001d0 20 44 43 20 6e 65 65 64 65 64 20 66 6f 72 20 74 | DC needed for t| 000001e0 68 65 20 64 72 69 76 65 2e 0d 0d 54 68 65 20 74 |he drive...The t| 000001f0 72 61 6e 73 66 6f 72 6d 65 72 2e 0d 0d 4d 75 63 |ransformer...Muc| 00000200 68 20 68 61 73 20 62 65 65 6e 20 73 61 69 64 20 |h has been said | 00000210 6f 76 65 72 20 74 68 65 20 79 65 61 72 73 20 61 |over the years a| 00000220 62 6f 75 74 20 74 68 65 20 70 6f 74 65 6e 74 69 |bout the potenti| 00000230 61 6c 20 64 61 6e 67 65 72 73 20 6f 66 20 6d 61 |al dangers of ma| 00000240 69 6e 73 0d 76 6f 6c 74 61 67 65 2e 20 41 73 20 |ins.voltage. As | 00000250 61 6e 20 65 6c 65 63 74 72 69 63 69 61 6e 20 61 |an electrician a| 00000260 6e 64 20 61 73 20 73 6f 6d 65 6f 6e 65 20 77 69 |nd as someone wi| 00000270 74 68 20 6d 65 64 69 63 61 6c 20 71 75 61 6c 69 |th medical quali| 00000280 66 69 63 61 74 69 6f 6e 73 20 49 20 61 6d 0d 70 |fications I am.p| 00000290 65 72 68 61 70 73 20 62 65 74 74 65 72 20 70 6c |erhaps better pl| 000002a0 61 63 65 64 20 74 68 61 6e 20 6d 6f 73 74 20 74 |aced than most t| 000002b0 6f 20 75 6e 64 65 72 73 74 61 6e 64 20 74 68 65 |o understand the| 000002c0 73 65 20 64 61 6e 67 65 72 73 2e 0d 0d 49 74 20 |se dangers...It | 000002d0 68 61 73 20 62 65 65 6e 20 61 74 20 6c 65 61 73 |has been at leas| 000002e0 74 20 38 20 79 65 61 72 73 20 73 69 6e 63 65 20 |t 8 years since | 000002f0 49 20 67 6f 74 20 61 20 73 68 6f 63 6b 20 66 72 |I got a shock fr| 00000300 6f 6d 20 74 68 65 20 6d 61 69 6e 73 2c 20 61 20 |om the mains, a | 00000310 62 6f 6c 74 20 61 73 0d 65 6c 65 63 74 72 69 63 |bolt as.electric| 00000320 69 61 6e 73 20 63 61 6c 6c 20 69 74 2e 20 49 20 |ians call it. I | 00000330 61 76 6f 69 64 20 69 74 20 62 65 63 61 75 73 65 |avoid it because| 00000340 20 49 20 6b 6e 6f 77 20 74 68 65 20 72 69 73 6b | I know the risk| 00000350 73 20 61 6e 64 20 49 20 61 6d 0d 63 61 72 65 66 |s and I am.caref| 00000360 75 6c 2e 20 49 20 61 6c 77 61 79 73 20 63 68 65 |ul. I always che| 00000370 63 6b 20 6d 79 20 63 6f 6e 6e 65 63 74 69 6f 6e |ck my connection| 00000380 73 20 62 65 66 6f 72 65 20 49 20 63 6f 6e 6e 65 |s before I conne| 00000390 63 74 20 74 6f 20 74 68 65 20 6d 61 69 6e 73 2e |ct to the mains.| 000003a0 20 49 0d 74 65 73 74 20 63 6f 6e 6e 65 63 74 69 | I.test connecti| 000003b0 6f 6e 73 20 77 69 74 68 20 61 20 73 75 69 74 61 |ons with a suita| 000003c0 62 6c 65 20 63 68 65 63 6b 69 6e 67 20 64 65 76 |ble checking dev| 000003d0 69 63 65 20 62 65 66 6f 72 65 20 49 20 74 6f 75 |ice before I tou| 000003e0 63 68 20 74 68 65 6d 2e 20 4d 79 0d 63 6f 6e 6e |ch them. My.conn| 000003f0 65 63 74 69 6f 6e 73 20 61 72 65 20 61 6c 77 61 |ections are alwa| 00000400 79 73 20 74 69 64 79 20 77 69 74 68 20 6e 6f 20 |ys tidy with no | 00000410 64 69 72 74 20 6f 72 20 62 69 74 73 20 6f 66 20 |dirt or bits of | 00000420 77 69 72 65 20 68 61 6e 67 69 6e 67 20 61 72 6f |wire hanging aro| 00000430 75 6e 64 2e 20 49 0d 6e 65 76 65 72 20 73 61 79 |und. I.never say| 00000440 2c 20 74 68 61 74 20 77 69 6c 6c 20 64 6f 20 66 |, that will do f| 00000450 6f 72 20 6e 6f 77 20 77 68 69 6c 65 20 49 20 63 |or now while I c| 00000460 68 65 63 6b 20 69 74 2e 20 49 20 61 6c 77 61 79 |heck it. I alway| 00000470 73 20 6d 61 6b 65 20 73 75 72 65 20 74 68 61 74 |s make sure that| 00000480 0d 65 76 65 72 79 20 63 6f 6e 6e 65 63 74 69 6f |.every connectio| 00000490 6e 20 69 73 20 73 61 66 65 20 62 65 66 6f 72 65 |n is safe before| 000004a0 20 49 20 6c 65 61 76 65 20 69 74 2e 20 41 6e 64 | I leave it. And| 000004b0 2c 20 49 20 6e 65 76 65 72 20 74 72 75 73 74 20 |, I never trust | 000004c0 61 6e 79 6f 6e 65 20 74 6f 0d 64 69 73 63 6f 6e |anyone to.discon| 000004d0 6e 65 63 74 20 74 68 65 20 6d 61 69 6e 73 20 66 |nect the mains f| 000004e0 6f 72 20 6d 65 2c 20 69 66 20 73 6f 6d 65 6f 6e |or me, if someon| 000004f0 65 20 64 6f 65 73 2c 20 49 20 63 68 65 63 6b 20 |e does, I check | 00000500 74 68 61 74 20 69 74 20 69 73 20 72 65 61 6c 6c |that it is reall| 00000510 79 0d 64 69 73 63 6f 6e 6e 65 63 74 65 64 20 62 |y.disconnected b| 00000520 65 66 6f 72 65 20 70 72 6f 63 65 64 69 6e 67 2e |efore proceding.| 00000530 0d 0d 53 75 69 74 61 62 6c 65 20 63 68 65 63 6b |..Suitable check| 00000540 69 6e 67 20 64 65 76 69 63 65 73 20 69 6e 63 6c |ing devices incl| 00000550 75 64 65 20 61 20 67 6f 6f 64 20 76 6f 6c 74 20 |ude a good volt | 00000560 6d 65 74 65 72 20 73 65 74 20 61 74 20 32 34 30 |meter set at 240| 00000570 56 20 41 43 20 6f 72 20 61 73 0d 6e 65 61 72 20 |V AC or as.near | 00000580 61 73 2e 20 54 68 69 73 20 77 69 6c 6c 20 62 65 |as. This will be| 00000590 20 77 68 61 74 20 6d 6f 73 74 20 70 65 6f 70 6c | what most peopl| 000005a0 65 20 68 61 76 65 2e 20 45 6c 65 63 74 72 69 63 |e have. Electric| 000005b0 69 61 6e 73 20 68 61 76 65 20 76 6f 6c 74 20 70 |ians have volt p| 000005c0 72 6f 62 65 73 0d 62 75 74 20 49 20 64 6f 6e 27 |robes.but I don'| 000005d0 74 20 65 78 70 65 63 74 20 6d 6f 73 74 20 70 65 |t expect most pe| 000005e0 6f 70 6c 65 20 74 6f 20 68 61 76 65 20 74 68 65 |ople to have the| 000005f0 73 65 2e 20 4e 65 6f 6e 20 73 63 72 65 77 64 72 |se. Neon screwdr| 00000600 69 76 65 72 73 20 61 72 65 20 6e 6f 74 0d 73 75 |ivers are not.su| 00000610 69 74 61 62 6c 65 2c 20 74 68 65 79 20 61 72 65 |itable, they are| 00000620 20 64 61 6e 67 65 72 6f 75 73 2c 20 75 6e 72 65 | dangerous, unre| 00000630 6c 69 61 62 6c 65 20 61 6e 64 20 75 73 65 6c 65 |liable and usele| 00000640 73 73 2e 20 49 20 6b 6e 6f 77 20 73 6f 6d 65 0d |ss. I know some.| 00000650 65 6c 65 63 74 72 69 63 69 61 6e 73 20 75 73 65 |electricians use| 00000660 20 74 68 65 6d 20 62 75 74 20 74 68 61 74 20 64 | them but that d| 00000670 6f 65 73 6e 27 74 20 6d 61 6b 65 20 74 68 65 6d |oesn't make them| 00000680 20 72 69 67 68 74 2e 20 57 68 65 6e 20 79 6f 75 | right. When you| 00000690 20 75 73 65 20 61 0d 6e 65 6f 6e 20 73 63 72 65 | use a.neon scre| 000006a0 77 64 72 69 76 65 72 20 74 68 65 20 6d 65 74 61 |wdriver the meta| 000006b0 6c 20 74 69 70 20 74 6f 75 63 68 65 73 20 74 68 |l tip touches th| 000006c0 65 20 6d 61 69 6e 73 20 77 68 69 63 68 20 74 72 |e mains which tr| 000006d0 61 76 65 6c 73 20 75 70 20 74 68 72 6f 75 67 68 |avels up through| 000006e0 0d 61 20 76 65 72 79 20 64 65 6c 69 63 61 74 65 |.a very delicate| 000006f0 20 6e 65 6f 6e 20 69 6e 64 69 63 61 74 6f 72 2c | neon indicator,| 00000700 20 74 68 72 6f 75 67 68 20 74 68 65 20 6d 65 74 | through the met| 00000710 61 6c 20 74 69 70 2c 20 75 70 20 79 6f 75 72 20 |al tip, up your | 00000720 61 72 6d 2c 0d 74 68 72 6f 75 67 68 20 79 6f 75 |arm,.through you| 00000730 72 20 68 65 61 72 74 2c 20 6c 75 6e 67 73 2c 20 |r heart, lungs, | 00000740 6c 69 76 65 72 2c 20 73 74 6f 6d 61 63 68 2c 20 |liver, stomach, | 00000750 69 6e 74 65 73 74 69 6e 65 73 2c 20 6b 69 64 6e |intestines, kidn| 00000760 65 79 73 2c 20 79 6f 75 72 0d 70 72 69 76 61 74 |eys, your.privat| 00000770 65 73 2c 20 64 6f 77 6e 20 79 6f 75 72 20 6c 65 |es, down your le| 00000780 67 73 20 61 6e 64 20 69 6e 74 6f 20 67 72 6f 75 |gs and into grou| 00000790 6e 64 2e 20 59 6f 75 20 6d 61 79 20 6e 6f 74 20 |nd. You may not | 000007a0 66 65 65 6c 20 69 74 20 62 75 74 20 74 68 61 74 |feel it but that| 000007b0 0d 64 6f 65 73 6e 27 74 20 6d 65 61 6e 20 69 74 |.doesn't mean it| 000007c0 27 73 20 73 61 66 65 2e 20 41 64 64 65 64 20 74 |'s safe. Added t| 000007d0 6f 20 74 68 69 73 20 69 73 20 74 68 65 20 76 65 |o this is the ve| 000007e0 72 79 20 72 65 61 6c 20 70 6f 74 65 6e 74 69 61 |ry real potentia| 000007f0 6c 20 66 6f 72 0d 66 61 6c 75 72 65 20 6f 66 20 |l for.falure of | 00000800 74 68 65 20 6e 65 6f 6e 27 73 20 72 65 73 69 73 |the neon's resis| 00000810 74 61 6e 63 65 20 61 6e 64 20 7a 61 70 2e 2e 2e |tance and zap...| 00000820 0d 0d 49 20 77 72 6f 74 65 20 61 20 64 65 73 63 |..I wrote a desc| 00000830 72 69 70 74 69 6f 6e 20 6f 66 20 77 68 61 74 20 |ription of what | 00000840 61 63 74 75 61 6c 6c 79 20 68 61 70 70 65 6e 73 |actually happens| 00000850 20 77 68 65 6e 20 79 6f 75 20 67 65 74 20 65 6c | when you get el| 00000860 65 63 74 72 6f 63 75 74 65 64 0d 62 75 74 20 61 |ectrocuted.but a| 00000870 66 74 65 72 20 72 65 61 64 69 6e 67 20 69 74 20 |fter reading it | 00000880 74 68 72 6f 75 67 68 20 49 20 64 65 63 69 64 65 |through I decide| 00000890 64 20 69 74 20 77 61 73 20 74 6f 6f 20 67 72 75 |d it was too gru| 000008a0 65 73 6f 6d 2e 20 53 75 66 66 69 63 65 20 74 6f |esom. Suffice to| 000008b0 20 73 61 79 0d 74 68 61 74 20 65 6c 65 63 74 72 | say.that electr| 000008c0 6f 63 75 74 69 6f 6e 20 69 73 20 6e 6f 74 20 61 |ocution is not a| 000008d0 20 71 75 69 63 6b 20 64 65 61 74 68 2c 20 69 74 | quick death, it| 000008e0 20 69 73 20 73 6c 6f 77 20 61 6e 64 20 76 65 72 | is slow and ver| 000008f0 79 20 70 61 69 6e 66 75 6c 2e 20 59 6f 75 0d 6d |y painful. You.m| 00000900 61 79 20 68 61 76 65 20 68 61 64 20 61 20 66 65 |ay have had a fe| 00000910 77 20 62 6f 6c 74 73 20 61 6e 64 20 73 6f 20 66 |w bolts and so f| 00000920 61 72 20 67 6f 74 20 61 77 61 79 20 77 69 74 68 |ar got away with| 00000930 20 69 74 2e 20 59 6f 75 20 68 61 76 65 20 6a 75 | it. You have ju| 00000940 73 74 20 62 65 65 6e 0d 6c 75 63 6b 79 2e 20 54 |st been.lucky. T| 00000950 68 65 72 65 20 69 73 20 6e 6f 20 6d 65 74 68 6f |here is no metho| 00000960 64 20 6f 66 20 70 72 6f 74 65 63 74 69 6e 67 20 |d of protecting | 00000970 79 6f 75 72 73 65 6c 66 20 66 72 6f 6d 20 61 20 |yourself from a | 00000980 6d 61 69 6e 73 20 73 68 6f 63 6b 2c 20 71 75 69 |mains shock, qui| 00000990 63 6b 0d 72 65 61 63 74 69 6f 6e 73 20 61 72 65 |ck.reactions are| 000009a0 20 6f 66 20 6e 6f 20 75 73 65 20 73 69 6e 63 65 | of no use since| 000009b0 20 79 6f 75 72 20 6e 65 72 76 65 20 65 6e 64 69 | your nerve endi| 000009c0 6e 67 73 20 77 69 6c 6c 20 62 65 20 66 72 6f 7a |ngs will be froz| 000009d0 65 6e 2e 20 54 68 65 20 6f 6e 6c 79 0d 65 66 66 |en. The only.eff| 000009e0 65 63 74 69 76 65 20 6d 65 74 68 6f 64 20 69 73 |ective method is| 000009f0 20 6e 6f 74 20 74 6f 20 6c 65 74 20 69 74 20 68 | not to let it h| 00000a00 61 70 70 65 6e 20 61 74 20 61 6c 6c 2e 0d 0d 54 |appen at all...T| 00000a10 68 65 73 65 20 6e 65 6f 6e 73 20 61 72 65 6e 27 |hese neons aren'| 00000a20 74 20 65 76 65 6e 20 76 65 72 79 20 67 6f 6f 64 |t even very good| 00000a30 20 66 6f 72 20 73 63 72 65 77 73 20 73 69 6e 63 | for screws sinc| 00000a40 65 20 74 68 65 20 74 69 70 73 20 74 65 6e 64 20 |e the tips tend | 00000a50 74 6f 20 62 72 65 61 6b 2e 0d 54 68 65 72 65 20 |to break..There | 00000a60 69 73 20 61 20 77 61 79 20 74 6f 20 6d 61 6b 65 |is a way to make| 00000a70 20 74 68 65 6d 20 73 61 66 65 20 68 6f 77 65 76 | them safe howev| 00000a80 65 72 2c 20 50 6c 61 63 65 20 74 68 65 20 6e 65 |er, Place the ne| 00000a90 6f 6e 20 73 63 72 65 77 20 64 72 69 76 65 72 20 |on screw driver | 00000aa0 6f 6e 20 61 0d 68 61 72 64 20 73 75 72 66 61 63 |on a.hard surfac| 00000ab0 65 2c 20 74 61 6b 65 20 61 20 6c 61 72 67 65 20 |e, take a large | 00000ac0 68 61 6d 6d 65 72 2c 20 72 61 69 73 65 20 69 74 |hammer, raise it| 00000ad0 20 61 62 6f 75 74 20 32 20 66 65 65 74 20 61 62 | about 2 feet ab| 00000ae0 6f 76 65 20 61 6e 64 20 62 72 69 6e 67 0d 69 74 |ove and bring.it| 00000af0 20 64 6f 77 6e 20 6f 6e 74 6f 20 74 68 65 20 68 | down onto the h| 00000b00 61 6e 64 6c 65 20 77 69 74 68 20 73 6f 6d 65 20 |andle with some | 00000b10 66 6f 72 63 65 2e 20 46 69 6e 61 6c 6c 79 20 73 |force. Finally s| 00000b20 77 65 65 70 20 75 70 20 74 68 65 20 72 65 6d 61 |weep up the rema| 00000b30 69 6e 73 20 77 69 74 68 0d 61 20 64 75 73 74 70 |ins with.a dustp| 00000b40 61 6e 20 61 6e 64 20 70 75 74 20 69 74 20 69 6e |an and put it in| 00000b50 20 74 68 65 20 62 69 6e 2e 0d 0d 42 75 79 69 6e | the bin...Buyin| 00000b60 67 20 61 20 74 72 61 6e 73 66 6f 72 6d 65 72 2e |g a transformer.| 00000b70 0d 0d 4d 61 70 6c 69 6e 20 73 65 6c 6c 20 61 20 |..Maplin sell a | 00000b80 73 75 69 74 61 62 6c 65 20 74 72 61 6e 73 66 6f |suitable transfo| 00000b90 72 6d 65 72 20 63 6f 64 65 20 57 42 32 35 43 20 |rmer code WB25C | 00000ba0 66 6f 72 20 60 39 2e 35 30 2e 20 49 74 20 68 61 |for `9.50. It ha| 00000bb0 73 20 32 20 31 32 56 0d 6f 75 74 70 75 74 73 20 |s 2 12V.outputs | 00000bc0 61 6e 64 20 69 73 20 72 61 74 65 64 20 61 74 20 |and is rated at | 00000bd0 32 35 56 41 20 73 6f 20 65 61 63 68 20 31 32 56 |25VA so each 12V| 00000be0 20 6c 69 6e 65 20 63 61 6e 20 70 72 6f 64 75 63 | line can produc| 00000bf0 65 20 31 41 2e 20 41 20 63 68 65 61 70 65 72 0d |e 1A. A cheaper.| 00000c00 6f 6e 65 20 63 6f 75 6c 64 20 70 72 6f 62 61 62 |one could probab| 00000c10 6c 79 20 62 65 20 68 61 64 20 66 72 6f 6d 20 61 |ly be had from a| 00000c20 20 6c 6f 63 61 6c 20 65 6c 65 63 74 72 6f 6e 69 | local electroni| 00000c30 63 73 20 73 74 6f 72 65 20 69 66 20 79 6f 75 20 |cs store if you | 00000c40 6b 6e 6f 77 20 6f 66 0d 6f 6e 65 2e 20 0d 0d 4e |know of.one. ..N| 00000c50 65 78 74 20 79 6f 75 20 6e 65 65 64 20 61 20 73 |ext you need a s| 00000c60 75 69 74 61 62 6c 65 20 63 61 73 65 2e 20 54 68 |uitable case. Th| 00000c70 65 20 63 61 73 65 20 73 68 6f 75 6c 64 20 62 65 |e case should be| 00000c80 20 6c 61 72 67 65 20 65 6e 6f 75 67 68 20 74 6f | large enough to| 00000c90 20 74 61 6b 65 20 74 68 65 0d 74 72 61 6e 73 66 | take the.transf| 00000ca0 6f 72 6d 65 72 20 61 6e 64 20 68 61 76 65 20 61 |ormer and have a| 00000cb0 62 6f 75 74 20 33 20 69 6e 63 68 65 73 20 78 20 |bout 3 inches x | 00000cc0 33 20 69 6e 63 68 65 73 20 6c 65 66 74 20 66 6f |3 inches left fo| 00000cd0 72 20 74 68 65 20 63 69 72 63 75 69 74 20 62 6f |r the circuit bo| 00000ce0 61 72 64 2e 0d 0d 49 64 65 61 6c 6c 79 20 74 68 |ard...Ideally th| 00000cf0 65 20 63 61 73 65 20 73 68 6f 75 6c 64 20 62 65 |e case should be| 00000d00 20 6d 61 64 65 20 6f 66 20 6d 65 74 61 6c 2c 20 | made of metal, | 00000d10 70 72 65 73 73 65 64 20 61 6c 75 6d 69 6e 69 75 |pressed aluminiu| 00000d20 6d 20 63 61 73 65 73 20 61 72 65 0d 77 69 64 65 |m cases are.wide| 00000d30 6c 79 20 61 76 61 69 6c 61 62 6c 65 20 61 6e 64 |ly available and| 00000d40 20 71 75 69 74 65 20 63 68 65 61 70 2e 20 49 74 | quite cheap. It| 00000d50 20 6d 75 73 74 20 6f 66 20 63 6f 75 72 73 65 20 | must of course | 00000d60 68 61 76 65 20 61 20 6c 69 64 2e 0d 0d 54 68 65 |have a lid...The| 00000d70 20 66 69 72 73 74 20 72 75 6c 65 20 69 73 20 74 | first rule is t| 00000d80 6f 20 70 75 74 20 79 6f 75 72 20 74 72 61 6e 73 |o put your trans| 00000d90 66 6f 72 6d 65 72 20 69 6e 74 6f 20 61 20 73 75 |former into a su| 00000da0 69 74 61 62 6c 65 20 63 61 73 65 2c 20 6d 61 6b |itable case, mak| 00000db0 65 0d 73 75 72 65 20 79 6f 75 72 20 63 6f 6e 6e |e.sure your conn| 00000dc0 65 63 74 69 6f 6e 73 20 61 72 65 20 67 6f 6f 64 |ections are good| 00000dd0 20 61 6e 64 20 6d 61 6b 65 20 73 75 72 65 20 74 | and make sure t| 00000de0 68 61 74 20 74 68 65 20 63 61 62 6c 65 20 69 73 |hat the cable is| 00000df0 20 61 64 65 71 75 61 74 6c 79 0d 70 72 6f 74 65 | adequatly.prote| 00000e00 63 74 65 64 20 61 73 20 69 74 20 6c 65 61 76 65 |cted as it leave| 00000e10 73 20 74 68 65 20 63 61 73 65 20 62 6f 74 68 20 |s the case both | 00000e20 66 72 6f 6d 20 64 61 6d 61 67 65 20 66 72 6f 6d |from damage from| 00000e30 20 74 68 65 20 65 64 67 65 73 20 6f 66 20 74 68 | the edges of th| 00000e40 65 20 63 61 73 65 0d 61 6e 64 20 66 72 6f 6d 20 |e case.and from | 00000e50 62 65 69 6e 67 20 70 75 6c 6c 65 64 20 61 6e 64 |being pulled and| 00000e60 20 70 65 72 68 61 70 73 20 63 6f 6d 6d 69 6e 67 | perhaps comming| 00000e70 20 6c 6f 6f 73 65 2e 20 41 20 73 74 72 61 69 6e | loose. A strain| 00000e80 20 72 65 6c 69 65 66 20 67 72 6f 6d 6d 65 74 0d | relief grommet.| 00000e90 77 69 6c 6c 20 64 6f 20 74 68 69 73 20 71 75 69 |will do this qui| 00000ea0 74 65 20 77 65 6c 6c 2e 20 54 68 65 20 63 61 62 |te well. The cab| 00000eb0 6c 65 20 77 69 6c 20 6e 65 65 64 20 74 6f 20 62 |le wil need to b| 00000ec0 65 20 33 20 63 6f 72 65 20 61 6e 64 20 63 61 70 |e 3 core and cap| 00000ed0 61 62 6c 65 20 6f 66 0d 63 61 72 72 79 69 6e 67 |able of.carrying| 00000ee0 20 33 41 20 73 6f 20 63 68 6f 73 65 20 61 20 67 | 3A so chose a g| 00000ef0 72 6f 6d 6d 65 74 20 66 6f 72 20 74 68 69 73 20 |rommet for this | 00000f00 73 69 7a 65 20 6f 66 20 63 61 62 6c 65 2e 20 54 |size of cable. T| 00000f10 68 65 20 68 6f 6c 65 20 66 6f 72 20 6f 6e 65 20 |he hole for one | 00000f20 6f 66 0d 74 68 65 73 65 20 67 72 6f 6d 6d 65 74 |of.these grommet| 00000f30 73 20 68 61 73 20 74 6f 20 62 65 20 61 20 72 61 |s has to be a ra| 00000f40 74 68 65 72 20 6f 64 64 20 73 68 61 70 65 2c 20 |ther odd shape, | 00000f50 6e 6f 74 20 72 6f 75 6e 64 2e 20 48 6f 77 65 76 |not round. Howev| 00000f60 65 72 20 49 20 68 61 76 65 0d 66 6f 75 6e 64 20 |er I have.found | 00000f70 74 68 61 74 20 69 66 20 79 6f 75 20 64 72 69 6c |that if you dril| 00000f80 6c 20 61 20 72 6f 75 6e 64 20 68 6f 6c 65 20 61 |l a round hole a| 00000f90 6e 64 20 70 75 73 68 20 74 68 65 20 67 72 6f 6d |nd push the grom| 00000fa0 6d 65 74 20 66 72 6f 6d 20 74 68 65 20 69 6e 73 |met from the ins| 00000fb0 69 64 65 0d 6f 66 20 74 68 65 20 63 61 73 65 20 |ide.of the case | 00000fc0 6f 75 74 20 69 74 20 77 69 6c 6c 20 62 65 20 67 |out it will be g| 00000fd0 6f 6f 64 20 61 6e 64 20 73 74 72 6f 6e 67 2e 0d |ood and strong..| 00000fe0 62 6f 61 72 64 20 77 68 69 63 68 20 77 69 6c 6c |board which will| 00000ff0 20 62 65 20 74 68 65 20 73 65 63 6f 6e 64 20 73 | be the second s| 00001000 74 61 67 65 2e 0d 0d 54 68 65 20 63 69 72 63 75 |tage...The circu| 00001010 69 74 20 69 74 73 65 6c 66 20 73 68 6f 75 6c 64 |it itself should| 00001020 20 62 65 20 62 75 69 6c 74 20 6f 6e 74 6f 20 76 | be built onto v| 00001030 65 72 6f 20 73 74 72 69 70 20 62 6f 61 72 64 2e |ero strip board.| 00001040 20 43 61 72 65 66 75 6c 0d 73 6f 6c 64 65 72 69 | Careful.solderi| 00001050 6e 67 20 69 73 20 6e 65 65 64 65 64 2e 20 0d 0d |ng is needed. ..| 00001060 54 68 65 20 63 61 62 6c 65 20 67 6f 69 6e 67 20 |The cable going | 00001070 6f 75 74 20 74 6f 20 74 68 65 20 6c 6f 77 20 76 |out to the low v| 00001080 6f 6c 74 61 67 65 20 70 6f 77 65 72 20 70 6c 75 |oltage power plu| 00001090 67 20 63 6f 75 6c 64 20 62 65 20 74 68 65 20 73 |g could be the s| 000010a0 61 6d 65 20 61 73 20 74 68 65 0d 6d 61 69 6e 73 |ame as the.mains| 000010b0 20 63 61 62 6c 65 2e 20 41 20 73 74 72 61 69 6e | cable. A strain| 000010c0 20 72 65 6c 69 65 66 20 67 72 6f 6d 6d 65 74 20 | relief grommet | 000010d0 63 61 6e 20 62 65 20 75 73 65 64 20 61 67 61 69 |can be used agai| 000010e0 6e 20 74 6f 20 70 72 6f 74 65 63 74 20 69 74 2e |n to protect it.| 000010f0 0d 0d 43 68 65 63 6b 20 61 6c 6c 20 63 6f 6e 6e |..Check all conn| 00001100 65 63 74 69 6f 6e 73 20 61 6e 64 20 6a 6f 69 6e |ections and join| 00001110 74 73 20 61 6e 64 20 77 68 65 6e 20 79 6f 75 20 |ts and when you | 00001120 68 61 76 65 20 66 69 6e 69 73 68 65 64 20 63 68 |have finished ch| 00001130 65 63 6b 20 74 68 65 0d 76 6f 6c 74 61 67 65 20 |eck the.voltage | 00001140 6f 75 74 70 75 74 20 69 6e 20 65 61 63 68 20 6c |output in each l| 00001150 69 6e 65 20 62 65 66 6f 72 65 20 79 6f 75 20 63 |ine before you c| 00001160 6f 6e 6e 65 63 74 20 74 6f 20 79 6f 75 72 20 64 |onnect to your d| 00001170 72 69 76 65 2e 20 54 68 65 73 65 20 64 72 69 76 |rive. These driv| 00001180 65 73 0d 64 6f 6e 27 74 20 6c 69 6b 65 20 74 68 |es.don't like th| 00001190 65 20 77 72 6f 6e 67 20 76 6f 6c 74 61 67 65 20 |e wrong voltage | 000011a0 62 65 69 6e 67 20 63 6f 6e 6e 65 63 74 65 64 20 |being connected | 000011b0 61 6e 64 20 6f 6e 63 65 20 79 6f 75 72 20 64 72 |and once your dr| 000011c0 69 76 65 20 69 73 20 62 72 6f 6b 65 6e 0d 79 6f |ive is broken.yo| 000011d0 75 20 72 65 61 6c 6c 79 20 6e 65 65 64 20 74 6f |u really need to| 000011e0 20 74 68 72 6f 77 20 69 74 20 61 77 61 79 2e 20 | throw it away. | 000011f0 52 65 70 61 69 72 65 72 73 20 61 72 65 20 64 69 |Repairers are di| 00001200 66 66 69 63 75 6c 74 20 74 6f 20 66 69 6e 64 20 |fficult to find | 00001210 61 6e 64 0d 65 78 70 65 6e 73 69 76 65 2e 0d 0d |and.expensive...| 00001220
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