Manually Triggered VCO 4046 (CB25758E)

We found this circuit with the CMOS4046 in the August 1994 Electronics Now magazine. The circuit is activated by pressing switch S1.

| Clique na imagem para ampliar |

Capacitive Discharge Ignition (CB12639E)
The critical component of this circuit is the transformer. T1 and T2 can be BD135 and T3 / T4 can...
RS Bistable LM3900 (CB19127E)
The figure shows how to implement an R-S flip-flop or bistable reset-Set with an LM3900...
Car Timed Alarm f (CB16431E)
This circuit was found in a 1987 documentation but uses components quite common in the current...