The signals from this circuit obtained from the 1965 Radio Shack documentation are picked up from a medium wave receiver. L1 and L2 have 80 to 100 turns of yarn 28 on a ferrite rod.
The circuit shown in the figure is sensitive to light. Its frequency is determined by the light...
The LM10 is not common today, but the circuit can be adapted to operate with equivalent...
This circuit was suggested by Texas Instruments in a manual of operational amplifiers. Other...