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.
We found this circuit in a 1987 documentation. Its purpose is to turn on a garage light using the...
The oscillator of this circuit operates around 8 MHz, but the output will be at a frequency three times...
For counting to values higher than 16, many 4520 can be cascaded as shown in Figure . The EN...