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FM Stereo Demodulator by using AN7415 – Circuit Schematic
FM Stereo Demodulator by using AN7415
AN7415 is a monolithic integrated circuit that can be used in FM stereo demodulation applications. The operating voltage range is 1. 6 to 7Vdc. Two AA dry cells...
The CIRCLOMOS – Circuit Schematic
The CIRCLOMOS
Originally Posted by tiefbassuebertr Unfortunately I find only RF amplifier devices there (lowest frequency: 10 KHz). It would take the colloquial.....
Trying to remove RF – Circuit Schematic
Trying to remove RF
Any thoughts as to how to remove RF from a point-to-point chip amp? I suddenly seem to be picking up a RF signal. It is ever so slight that one must.....
3W FM Transmitters – Circuit Schematic
3W FM Transmitters
This is the schematic for an FM transmitter with 3 to 3. 5 W output power that can be used between 90 and 110 MHz. Although the stability isn`t so bad, a PLL ca...
2 Transistor FM Voice Transmitters – Circuit Schematic
2 Transistor FM Voice Transmitters
This circuit may be tuned to operate over the range 87-108MHz with a range of 20 or 30 metres. I have used a pair of BC548 transistors in this circuit. Although...
AM Transmitters – Circuit Schematic
AM Transmitters
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AM Receivers – Circuit Schematic
AM Receivers
This is a compact three transistor, regenerative receiver with fixed feedback. It is similar in principle to the ZN414 radio IC which is now no longer available...
Small Radio Transmitters – Circuit Schematic
Small Radio Transmitters
Information about building a small radio transmitter, which has a PCB 1. 75" x 2. 5" (45mm x 68 mm) and has a range of about 30 yards or so. The documentation w...
FM Transmitter Bugs – Circuit Schematic
FM Transmitter Bugs
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...
Field-strength meters – Circuit Schematic
Field-strength meters
This is a very straightforward circuit. The first stage acts as a crystal receiver. Use a germanium detector diode (like 1N34, but AA119 is much more common in ...
AM FM Simultaneous Transmitter Using Digital ICs – Circuit Schematic
AM FM Simultaneous Transmitter Using Digital ICs
FM and AM transmitter in one small device built of cd4001 integrated circuit. It broadcasts on 20MHz(AM) and 100Mhz(FM).....
Medium range transmitters – Circuit Schematic
Medium range transmitters
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Nostalgic Crystal Radios – Circuit Schematic
Nostalgic Crystal Radios
Apart from the diode (which replacement would need a PbS, Lead Sulphyde, galena cristal) everything you can see in the circuit (for the no power version) can be...
A small FM transmitter (SMD)s – Circuit Schematic
A small FM transmitter (SMD)s
This SMD FM transmitter has an operating frequency of about 80 to 115MHz. Under reasonable circumstances you will be able to receive its signal at a distance of...
4W FM Transmitters – Circuit Schematic
4W FM Transmitters
L2 RFC (resistance 1MOhm with wrapped around her inductor of enough coils from fine isolated wire. Scratch of utmost inductor and you stick in utmost the resist...
Transmitter FM 45W with valves – Circuit Schematic
Transmitter FM 45W with valves
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SW Receiver Using ZN414 – Circuit Schematic
SW Receiver Using ZN414
A Short Wave Receiver based on the MK484 (formerly ZN414) that includes the tropical bands and 49 metre bands.....
General purpose RF receiver – Circuit Schematic
General purpose RF receiver
A sensor project which transmits it`s measurements via a 433Mhz wireless communication link. On this page I will describe the details of my self built receiver ...
Variable PIN Attenuator – Circuit Schematic
Variable PIN Attenuator
This is a very useful RF attenuator circuit which works from 300KHz to the 3GHz range based on the quad PIN diode array HSMP-3816 from Avego. The lower PIN diod...
Saw Transmitter Circuit – Circuit Schematic
Saw Transmitter Circuit
This circuit uses a saw based oscillator with an output amplifier which drives a transistor. C1 and C2 and L1 are critical oscillator components. They form a ta...