LM331 Voltage Square Root to Frequency Converter (CB14438E)

This circuit is from 1994 documentation by National Semiconductor. What it does is convert the square root of a voltage to a proportional frequency.

| Clique na imagem para ampliar |

High frequency VCO (CB20604E)
This circuit can generate signals up to 100 kHz. Found in documentation from the 1980s, it makes...
Variable Reluctance Preamplifier (CB12902E)
Some old record players use variable reluctance phono pickups, requiring a special amplifier...
Servo amplifier (CB23676E)
This circuit is from a Radio Electronics from July 1965. The circuit uses components from the time...