This circuit was found in an 80's Poptronics. The circuit is a fast trigger whose signal can be taken from the Q2 collector. The supply can be done with voltages from 9 to 12 V.
Found in an English publication from 1967, this circuit generates 5 kHz signals with harmonics that...
This preamplifier circuit for turntable cartridges was found in the March 1994 issue of...
This circuit is from documentation from the 80s, so it makes use of an operational amplifier that...