Variable inductor instead of varible capacitor in FM crystal set
#FM
#crystal set
#variable inductor
#tuning
#radio receiver
#inductor
#frequency modulation
#DIY electronics
#analog circuit
#RF circuit
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Fm Light Beam Receiver Circuit
This receiver is designed to detect infrared (IR) or light beams that are frequency modulated on a 50-kHz carrier. The transistors Q2, Q1, Q3, and Q4 form an active filter and amplifier, while the differential amplifier formed by Q5 and...
Introduction
What can be done with old 2-Meter FM rigs that lack CTCSS tone capability? The solution is to add a tone encoder. Traditional tone encoders require knowledge of the repeater's tone and necessitate manual adjustment every time a different repeater...
YD1191 SINGLE-CHIP FM/AM RADIO IC
The YD7312 is a monolithic integrated circuit designed for a dual pre-amplifier circuit with Automatic Level Control (ALC) for the recording and playback amplifier of cassette tape recorders. It is manufactured by Wuxi Youda Electronics Co., Ltd.
The YD7312 integrated circuit...
FM Telephone Bugs
Small telephone bug. It listens to the telephone line on an FM receiver. It is self-powered and has a small part count. Circuit diagram, schematics, electronics project.
The small telephone bug is a compact and efficient device designed to intercept audio...
FM PLL controlled VCO
The main oscillator is printed in blue and is voltage controlled. In this construction, the VCO range is 88 to 108 MHz. As you can see from the blue arrows, some energy goes to an amplifier and some energy goes...
FM IF amplifier circuit composed of ceramic filters
This circuit features a ceramic filter integrated with an FM intermediate frequency (IF) amplifier. The FM IF amplifier circuit primarily consists of an input variable voltage regulator (T), ceramic filters (CF1), and additional components such as the IF amplifier and...
fm wireless microphone circuit
This FM wireless microphone is straightforward to construct and offers significant transmission capabilities, with a range of approximately 300 meters outdoors. Its compact component count and 3V operating voltage allow it to effectively penetrate multiple floors of an apartment building....
FM Wireless Microphone
This project is a simple, inexpensive, and engaging circuit designed for home experimenters or hobbyists. It functions as a basic transmitter capable of transmitting speech over a short distance, effectively serving as a cordless microphone. The circuit employs two integrated...
simple metal detector
Assemble the circuit on a perfboard or PCB, excluding the inductor. Attach two long wires in place of the inductor. Use a long rod and position the inductor.
The circuit assembly begins with the preparation of a perfboard or printed circuit...