This circuit is from a March 1978 Radio Electronics magazine article that showed how to build it. The circuit is TTL based and is powered. The components used can still be found.
This amplifier for sound equipment was found in the Philips Databook of 1990. The circuit can be...
This divider by 10 is synchronized because it is implemented based on TTL or CMOS logic according to...
This 1 transistor circuit is from a Radio Electronics from December 1958… The circuit is battery...