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15W FM transmitter circuit 2SC1942 – Circuit Schematic
15W FM transmitter circuit 2SC1942
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FM Stereo Transmitter circuit diagram Using BH1417 – Circuit Schematic
FM Stereo Transmitter circuit diagram Using BH1417
This circuit is a circuit diagram is included in the RF circuit. FM Transmitter circuit diagram using the IC BH1417. Where the integrated circuit design from RH...
Direct Conversion AM Radio – Circuit Schematic
Direct Conversion AM Radio
A 0th-level attack at designing a direct conversion AM radio receiver. "Direct conversion" means we use a mixer (which just multiplies two signals) to downshift...
eagle schematic capture: radio button circuit – Circuit Schematic
eagle schematic capture: radio button circuit
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ReceivingCircuit – Circuit Schematic
ReceivingCircuit
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7MHz SSB Ham Radio Transceiver circuit Part 2 – Circuit Schematic
7MHz SSB Ham Radio Transceiver circuit Part 2
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Block Diagram of 7MHz SSB (Ham Radio) Transceiver using MC1496 IRF840 and Ladder filter – Circuit Schematic
Block Diagram of 7MHz SSB (Ham Radio) Transceiver using MC1496 IRF840 and Ladder filter
The microphone amplifier / modulator is build around LM324 which is a quad op amplifier provides enough quality amplification to voice picked up by the condense...
10GHz White Box Conversion Notes – Circuit Schematic
10GHz White Box Conversion Notes
To convert the MaCom 10GHz "White Box" (or "Whitebox" for the search engines) unit for ham radio use. Since we`re following in the path of others who`ve already...
The FARA 2 meter amplifier project – Circuit Schematic
The FARA 2 meter amplifier project
This article describes a 2 meter amplifier capable of running 25-30 watts output. More than 35 amplifiers have been procured at a cost of less than $50 each in ...
Zenith TransOceanic Radio Theory of Operation – Circuit Schematic
Zenith TransOceanic Radio Theory of Operation
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FM Transmitter Circuit – Circuit Schematic
FM Transmitter Circuit
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4 Band Double Tuned Preselector – Circuit Schematic
4 Band Double Tuned Preselector
The circuit requires an RF input which can be from a longwire or a loop antenna. The Preamplifier has a range from 550kHz (Medium Wave) up to 30 MHz in the SW b...
SW RF Pre-Amplifier – Circuit Schematic
SW RF Pre-Amplifier
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
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Q- Multiplying Loop Antenna – Circuit Schematic
Q- Multiplying Loop Antenna
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Field Strength Meter – Circuit Schematic
Field Strength Meter
This is a wide band signal strength meter circuit which responds to small changes in RF energy, designed to be used for the VHF spectrum and will respond to AM ...
FM Transmitter – Circuit Schematic
FM Transmitter
This simple transmitter operates from a 9V battery as shown above. I personally built this for a purpose. This is how it happened:- "members of my singing group...
FM Receiver – Circuit Schematic
FM Receiver
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FM Transmitter from David Sayles – Circuit Schematic
FM Transmitter from David Sayles
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...
Antenna Tuning Unit – Circuit Schematic
Antenna Tuning Unit
A simple passive (no power required) circuit to match an antenna to a radio receiver. This will be a useful addition to the short wave listener, but in addition...