[ARC5] AM modulating an "ARC-5" transmitter... solid-state simplest modulator

[J Mcvey]

THat was back in the dark ages of semiconductor design. Bet the circuit has has no thermal stability at all due to it's lack of compenastion.   You  probably could have a nice stable one using nothing more than a mosfet, op amp and a few passive components.You might even get off easier if you use an electret mike. ( high output). 

 


     On Saturday, October 10, 2015 7:46 PM, Kenneth G. Gordon <kgordon2006 at frontier.com> wrote:
   

 I found it.

It is in April 1962 "73 Magazine" on page 46.

4 transistors, two caps, two resistors and a mic jack.

Neat.

Maximum modulation percentage is 75% which is completely adequate.

Ken W7EKB
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