Found in American documentation from the 1980s, this circuit has a throughput of 700 Hz and a flat response of 400 to 500 Hz, with crystals of 3 MHz. Crystals of 2 to 15 MHz can be used.
This analog meter circuit was found in the September 1989 issue of Radio Electronics magazine. The source...
When more current from a digital output is needed than a single output could source or drain, a...
We found this circuit in a Popular Electronics from the 90's. The circuit activates an oscillator...