This circuit was obtained from the April 1978 Radio Electronics magazine. The other circuit is a PLL of the time. The power supply must be 15 V symmetrical.
Suggested by a 90’s Radio Electronics, this circuit automatically activates the recording switch of an...
This circuit inverts the signal of any logic using a general purpose PNP transistor. The supply...
Suggested by Siliconix in documentation from the 90's, this circuit supports current equivalent...