Based on Texas Instruments documentation, this circuit is based on the BQ2000 a circuit used to power LEDs. The circuit can be used with lithium-ion batteries.
This circuit is from a 1992 publication. The transistors can be the BC549 or BC548 and the power...
Using a MAX644 this circuit was found in the April 1989 issue of Radio Electronics magazine. The...
This timer charges the C1 capacitor with constant current, thus determining the SCR triggering time that...