BarrieT Posted May 13, 2013 Share Posted May 13, 2013 (edited) I've been toying with the idea of building a 220 volt [mains] -to- 24 volt transformer inside a Clansman 24 volt battery case. I have been looking at ...... Brand new 24V 2A DC Regulated Switching Transformer Power Supply http://www.ebay.co.uk/itm/Brand-new-24V-2A-DC-Regulated-Switching-Transformer-Power-Supply-/270992313891?pt=UK_BOI_Electrical_Test_Measurement_Equipment_ET&hash=item3f18668e23#ht_2693wt_1136 on e-bay and was thinking this would provide enough voltage/current for a Clansman 351. The power supply would be housed inside an empty Clansman battery case, a mains cable exiting the battery box [possibly using a kettle style plug and socket] and the 24 volt output connected to the normal battery -to- radio connection tags. Does anyone foresee any problems ? Thanks Barrie Edited May 13, 2013 by Marmite!! Font size reduced Quote Link to comment Share on other sites More sharing options...
Diana and Jackie Posted May 13, 2013 Share Posted May 13, 2013 (edited) Problems - yes plenty - HF & VHF switching noise and its harmonics unless you use super duper filters. Stick to a linear conventional supply. It has also not been unknown for these things to go up in smoke and our homes are full of them (switching power supplies) Diana Edited May 13, 2013 by Marmite!! Quote removed due to large font size Quote Link to comment Share on other sites More sharing options...
g0ozs Posted May 13, 2013 Share Posted May 13, 2013 From memory I think the 352 and 320 on transmit are more like 4 amps. I remember a chap in Wales did list mains power supply units built into a 1AH battery case on e-bay a couple of years ago but I havent seen them since. The problem with the 351/2 and 320 is that they were never designed for noisy supplies - in a vehicle the normal approach was to float charge a battery off a DCCU (which is a switch mode supply but rather well made and expensive). So direct connection to a 24 v vehicle supply or a simple switch mode type would be unwise. I think the larger 4AH cases would be adequate for a linear 24V 4A supply if adequately ventilated, but you might struggle to find one ready made and new today. The alternative which I know quite a few people have done with dead Ni-Cd packs is to fill them with a pair of small 12V Yuasa sealed lead acid batteries that can then be float charged from a cheap "mobility battery" charger without too much trouble. Even with periodic replacement of the lead acid cells this is likely to be cheaper than a DCCU and fresh Ni-Cads. From experience it's best to get the metal cased type as opening them by carefully drilling out the rivets is much easier than plastic. The actual metal is surprisingly soft and relies on the batteries and foam packing for strength when assembled. You will probably need to line it with something stronger if you plan on building anything inside. Hope this helps Iain 73 de G0OZS Quote Link to comment Share on other sites More sharing options...
g0ozs Posted May 13, 2013 Share Posted May 13, 2013 E-Bay item 251002797394 is more like it (although physically too big). Linear PSUs tend to be costly Quote Link to comment Share on other sites More sharing options...
Diana and Jackie Posted May 13, 2013 Share Posted May 13, 2013 Costly at surplus prices? - depends where one gets the surplus from.... Diana E-Bay item 251002797394 is more like it (although physically too big). Linear PSUs tend to be costly Quote Link to comment Share on other sites More sharing options...
BarrieT Posted May 14, 2013 Author Share Posted May 14, 2013 Thank-you both. Obviously as safety comes first and I'm sure you both have much more knowledge than myself....... I take it as a resounding , 'no'. Back to the drawing board ! Thanks Barrie Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.