This 80's circuit uses an audio amplifier to obtain a symmetrical source from a single source. The maximum current is on the order of 1.3 A and the input voltage must not exceed 20 V.
This 9 + 9 V symmetrical power supply was obtained in a 1977 symmetric publication but can still be...
This simple circuit uses an SCR to lock the alarm once triggered. The circuit is from an English...
This 1967 Electronics World circuit is suitable for frequencies up to 1 MHz. The setting applies...