Found in a 90’s Popular Electronics, this circuit generates sinusoidal signals with frequency controlled by an input signal. C4, C3 and C1 together with R12 and R3 determine the frequency generated.
We found this circuit in a 1967 General Electric SCR manual. The time is set to R1 and depends on C1...
This circuit uses an ignition coil to generate the high voltage that electrifies a fence. However, in...
Found in an older Radio Electronics, this circuit generates signals that can be used with regular...