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Frequency-to-voltage converter

LM2907-N Basic Circuit

Build a basic LM2907-N circuit with labeled pins, component values and connection guidance.

Package view

LM2907-N in a circuit

A regulated supply, one resistor and two conversion capacitors.

Physical LM2907N-8 with a ground-crossing signal source, 1 nF timing capacitor, 100 kΩ and 1 µF averaging network, buffer feedback and voltmeter.
Matching labels connect; all grounds are common. The 1.200 V display is a nominal example, not a measurement.

Connect it, step by step

Follow the component values and pin connections

Supply both circuits

Join V+6 and COL5 to 12 V; connect ground and local bypass.

Set conversion and filtering

C1 sets the charge per input cycle. R1 sets volts per hertz; C2 smooths the reading.

Measure after settling

At 1 kHz, expect approximately 1.2 V for nominal parts and K = 1. Increase the rate to increase the output.

Component view