Frequency

A high gain transistor like the MPSA-18 for the first transistor will allow a much larger value for R, up to 1 Megohm. The circuit should draw between 18 and 45 mA, a value determined by the transistor gain and the value of R.

Here is a phase-shift audio oscillator with excellent distortion characteristics thanks to “softened” diode limiting provided by the 1N914 and resistor divider and degenerated gain provided by the 68 ohm emitter resistor.

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The frequency of the crystal is not critical as almost any other xtal for the 2-meter band will function FM Band Monaural Transmitter: FM Radio Transmitter: FM Radio Transmitter #1: Four Transistor Tracking Transmitter: Hear Amateurs on your FM Radio!: Light Sensing RF Transmitter: Micro Power FM Broadcasting Circuits: One Pot to Control Two Channels: Phasing SSB Exciter: RF Transmitter, Light Sensing: Simplest RF Transmitter: Small FM Transmitter: T Volt Transmitter: T Volt Transmitter: allows you to send video to any television in the house, Poptronix kit circuit Telephone Transmitter: Three Watt FM Transmitter: Two Transistor FM Transmitters: Two Valve 40m CW Transmitter: VHF / UHF T Volt Modulator: Elektor January1985 VHF FM Transmitter: VHF Transmitter: Video / Audio Wireless Transmitter: circuit diagram and project description Video emitter uses battery power: 08/30/2001 EDN - Design Ideas / The block diagram in Figure 1 shows how to make a cable-free, direct-video system.