Using a 4046 PLL, which is not very common nowadays, this circuit was found in the October 1994 issue of Electronics Now magazine. The power is provided by the transistor and is small in this case.
Found in a 90s Popular Electronics, this circuit is interspersed between the filter and the...
This is the simplest function that triggers the load if the level of the input signal is 1. In...
This non-inverting AC amplifier was found in the February 1990 issue of Radio Electronics...