This circuit appears elsewhere in this section and on this site. The circuit generates a linear ramp having been found in 1980s documentation. The transistor is a general purpose type.
August 2017 - The new DPS1133 power switches from Diodes Incorporated for currents up to 3.3 A...
This circuit produces an intermittent ring tone being triggered directly by the telephone line. However,...
Suggested by a 1990 book for amateurs, this circuit makes use of an integrated component that is...