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.
The operating frequency of this circuit is 465 Hz and the input voltage is 12 VAC. The circuit is...
This circuit was found in a 90's RF Design. The circuit employs an integrated of the time. The 56 to...
Found in a 1967 Electronics World, this circuit can use any modern equivalent FET. Observe the...