This amplified metronome was found in a 90s Popular Electronics. The circuit is powered by a 9 V battery but will also work with 6 V of 4 standard batteries.
Found in Popular Electronics from the 90s, this circuit generates signals in a frequency range set to...
This circuit provides 6.3V of output from a 9V input. The circuit was found in a Dutch publication from...
Based on operational amplifiers of the time, this circuit from the 1980s has high input impedance. The...