Frequency to voltage converter (CB6993E)

Found in Popular Electronics from the 90s, this circuit can be used in tachometers. The integrated circuit is not a common component today.

| Clique na imagem para ampliar |

Signal Tracer with MW Radio (CB20509)
In the figure we have a simple signal tracer circuit to be coupled to the volume control of an AM...
Flip Flop Toggle (CB24436E)
This circuit was found in documentation from the 90s, using components from that time. The...
Battery Desulfator Charger (CB19386E)
This circuit, obtained from old documentation, allows the recovery of sulfated batteries. The...