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 |

Interface CMOS – TTL (CB394E)
Figure Bellow shows how to interface CMOS circuitos with TTL using the 4049 or 4050 IC. The power...
Summing amplifier without adjustment (CB19718E)
This circuit is from a manual from the 80's and the operational one used, uncommon nowadays, can...
JFET voltage reference (CB21590E)
Based on National Semiconductor's LM4130 reference circuit, this circuit was found in Internet...