This amplifier for playback of recordings was found in a 1947 manual. It uses a push-pull output with a tube power supply.
Found in a 1965 General Electric Hobby Manual, this timer was originally created to operate with...
Found in a 90’s Radio Electronics magazine, this circuit uses a component from the time, difficult...
Only one LED is turned on when S1 and S2 are pressed. The LED that will be on is just the...