We found this circuit in a 1996 publication. The circuit uses components that are still common. The timing depends on C1, which can be changed, and the triac can be of any type.
Found in a 90s Hands On Electronics, this small preamp finds applications like microphones and other...
This bridge audio amplifier was found in the July 1984 issue of Radio Electronics magazine. The...
The CUT frequency for this filter is determined by the capacitors. The µA4138 is a quad version of...