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Power rf amplifier 802. 11g maxim max2247 – Circuit Schematic
Power rf amplifier 802. 11g maxim max2247
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A Simple Radio Receiver – Circuit Schematic
A Simple Radio Receiver
The diagrams below detail the development of a simple modular radio receiver based entirely on circuits and devices studied during the Part IA course on Linear ...
Japanese Antique Vacuum Tube Radios – Circuit Schematic
Japanese Antique Vacuum Tube Radios
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SSB generator unit – Circuit Schematic
SSB generator unit
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TuneAid – Circuit Schematic
TuneAid
After I built my KN-Q7 kitset 40m QRP single sideband (SSB) transceiver, described elsewhere on this site, I went on to build a matching low power "Z-match" ant...
Digital HF Antenna Analyser – Circuit Schematic
Digital HF Antenna Analyser
This instrument measures complex impedance over the 1. 6 - 33 MHz HF spectrum. It also calculates and displays the VSWR of the impedance referenced to 50 ohms. ...
Analog HF Antenna Analyser – Circuit Schematic
Analog HF Antenna Analyser
Results are shown on an analog VSWR meter. The design was originally published in `Break-In`, New Zealand`s amateur radio magazine in Sept/Oct 2005, and is repu...
Search for Varicaps – Circuit Schematic
Search for Varicaps
A 80m (3. 5 - 3. 9 MHz) SSB transceiver using a Collins 455 kHz mechanical filter in the IF chain. Such designs need some good front-end receiver selectivity in...
Simple RF Signal Generator – Circuit Schematic
Simple RF Signal Generator
This circuit came out of some work I did for the two antenna analysers which are described elsewhere on this site. Those instruments both include an RF signal g...
AM Modulator – Circuit Schematic
AM Modulator
This circuit uses two signal generators to simulate an Amplitude Modulated RF carrier wave. The output can be used to simulate the response of LC and tank circu...
Diode Charge Pump AM-FM Demodulators – Circuit Schematic
Diode Charge Pump AM-FM Demodulators
Frequency-to-voltage converters form part of a wide variety of instrumentation circuits. They also find use in radio as FM demodulators. One interesting configu...
TV Transmitter – Circuit Schematic
TV Transmitter
This is an Analogue TV Transmitter. Sound modulation is type FM with a 5. 5MHz carrier and video transmission is PAL. Frequency is adjustable via C5 and tunes 5...
Tracking Transmitter – Circuit Schematic
Tracking Transmitter
This is a small battery operated Tracking transmitter which broadcasts a repeating radio signal which can be detected by a directional antenna. The transmitter ...
SW Receiver Using ZN414 – Circuit Schematic
SW Receiver Using ZN414
The problem with amplifying weak radio signals is that you also amplify the noise. What you can receive depends on how much background noise is present, whether...
A SHORT WAVE REGENERATIVE RECEIVER – Circuit Schematic
A SHORT WAVE REGENERATIVE RECEIVER
Sensitivity and selectivity are issues that will invariably concern a short wave listener when he wishes to purchase a new receiver. Commercially available comm...
A BIPOLAR REGENERATIVE RECEIVER – Circuit Schematic
A BIPOLAR REGENERATIVE RECEIVER
Contrary to what some radio experimenters think, a bipolar regenerative design can be made to work efficiently. The major concern is the low input impedance of ...
Long Range FM Transmitter – Circuit Schematic
Long Range FM Transmitter
The power output of many transmitter circuits are very low because no power amplifier stages are incorporated. The transmitter circuit described here has an ext...
FM Transmitter – Circuit Schematic
FM Transmitter
This small transmitter uses a hartley type oscillator. Normally the capacitor in the tank circuit would connect at the base of the transistor, but at VHF the ba...
AM Transmitter – Circuit Schematic
AM Transmitter
An AM voice transmitter with variable tuning. The antenna circuit is also tuned and transmits via a long wire antenna. Please Note. It is illegal to transmit on...
ZN414 portable Receiver – Circuit Schematic
ZN414 portable Receiver
Designed around the popular ZN414 IC this receiver covers the medium wave band band from approximately 550 to 1600 KHz with the values shown. The coil and tunin...