Tone generator circuit Diagrams

Simple RF Noise Source Schematic Circuit Diagram

A noise generator with a wideband output signal is always handy to have around when you’re adjusting receivers and other types of HF equipment.

Simple RF Noise Source Schematic Diagram

The noise generator circuit described here uses the base-emitter junction of a transistor (in this case a BF199) operating under reverse bias. As a result, it acts as a Zener diode and generates a wideband noise signal. The noise signal passes through a 1-nF capacitor to the output connector (female BNC), which means that its low-frequency components do not appear at the output. The 47-Ω resistor gives the noise generator an output impedance of nearly 50 Ω.

You can easily fit the entire noise generator in a small metal enclosure equipped with a BNC connector. The supply voltage is not critical; anything in the range of 8 to 15 V will do.

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