This power step drains just 3.5 mA from the battery and can provide good playback on a 4-ohm speaker. The circuit is from an 80's documentation.
For the component values used in thisf this circuit, the frequency can be adjusted between 740 Hz and...
August 2016 - It can be obtained from Mouser Electronics Mikromidia of the MikroElektronika...
This sequential circuit with an optical coupler was found in a Popular Electronics from the 90s to...