555 Fm Circuit Circuit

Posted on May 18, 2012

Circuit for applying a dc-coupled FM or PPM to a 555 configured as an oscillator. IC-1 - Motorola MC-1374P. IC-2 - National LH0002C. L1, L2 - Mouser Electronics #421IF200. C1. C2 - Silver mica, 300 pF. All 0.1 uF cap., ceramic disc, 16V. C3 - 100 uF, 10 V, electrolytic ADJUSTMENT: Adjust R1 for minimum carrier; signal from function generator should generate 500 mVpp at pin 8 of IC-2 (suppressed carrier double sideband). Adjust R2 and function generator level-to achieve 800 mVpp at pin 8 of IC-2 (standard AM with carrier).

555 Fm Circuit Circuit
Click here to download the full size of the above Circuit.

Adjust L2 for 455 kHz. Adjust L1 for maximum output.

Leave Comment

characters left:

New Circuits



Popular Circuits

USB selector switch
Laser Power Supply Circuit
Nite Rider Lights
Condenser Pre Amplifier LM 1458
Stereo Tone Control
HI-FI integrated amplifier TDA7294-02 circuit
Binary gain step circuit diagram by the PGA205