Using a MAX644 this circuit was found in the April 1989 issue of Radio Electronics magazine. The circuit is for a 5 V voltage and 50 mA current output.
Circuits similar to this appear elsewhere in this section. The transistors can be BC549 (low...
This circuit is from an English publication from 1993 but can be easily assembled with the BD135...
This circuit, found in a Popular Electronics from 1978, causes two LEDs to flash alternately for a...