19 set AC power supply

[Mike K]

Originally Posted by Bob Carriere

.... now I can waste more time when at work....... with more to read !!!!


Maybe a dumb question but instead of converting the power supply is it not simpler to just use a large size 110 volts AC to 12 volt DC power supply..? and keep the radio original..!!!


Bob

Yes you can do that but the genemotors are rather power hungry . You would need a hefty 12V power supply capable of dissipating the heat involved . For a Mk 2 set , over 10 Amps continous . The genemotors are actually pretty good for HT voltage stability , the mechanial forces of the armature spinning around provide a good voltage regulation , eg they don't want to change speed quickly.

Some people just use a heavy truck battery in the radio shack.. And keep it well charged . The only thing is , the loud whining of the genemotor is a pain .

The other way, building a AC supply will give you a nice regulated high voltage for the transmit side if you use a reguator tube in it , if you don't , the HT voltage will change with load eg keying of the transmitter. If you are only receiving, then its not so critical. You an build them cheap from salvaged parts ..hamfests are a good soure of bits for projects . Old TV's provide chokes and bits too .

Sometimes, the output pass transistors of mains 12V supplies can be blown up by high voltage spikes eg from a vibrator HT supply running from it.

It depends on what you are planning on doing with the sets. MIKE