Cvscam

I have used the insides of a recordable greeting card before. I have seen the almost the same circuits in a recordable photo frame and a memo minder. I think Radio Shack sell it under Model: 276-1323.

I have a cheap meter so I would guess it is not true R.M.S. The 60 watt bulb was not at full brightness, I was using a Radio Shack transformer part number 273-1512 it shows rated at only 3 amps on the low side. The only parts that heated up was R1 and R2, the transistors just got a bit warm but I had heatsinks on them. I tried a 100w bulb and then I could hear the freq. go way and up and the circuit stopped working. I checked and one of the transistors is now bad. I used 69-206s for Q1 and Q2 I have a bunch of them that I got somewhere. I have a couple of old Microwaves and I am going to look into a better transformer.

I have built this circuit using a radio shack transformer and it worked so I did a little testing. I was using a full charged car battery and I measured 109 volts with no load and I tested it with a 60 watt lightbulb and the voltage dropped to about 105 volts. I didn't have a way to messure the frequency but it sounded close to 60 hertz.