radio Very basic circuit diagram question
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wireless headphones transmitter
This wireless headphone transmitter ensures a reliable connection over a distance of 2 meters. The oscillator frequency ranges between 1750 KHz and 3500 KHz, utilizing a ferrite bar as the antenna. IC1 amplifies the audio signal, while TC1 serves as...
All Transmitter & Receiver schematics
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Modulation monitor
A broad-tuned receiver demodulates the RF signal picked up by a loosely coupled wire placed near the transmitting antenna.
The broad-tuned receiver operates by utilizing a loosely coupled wire antenna, which is strategically positioned in proximity to the transmitting antenna. This...
RF based Automatic meter reading
RF based Automatic meter reading, or AMR, is the technology of automatically collecting data from energy meter and transferring that data to a central database for billing and/or analyzing. This means that billing can be based on actual consumption rather...
Wireless Telephone Line Spy
This is a phone bug circuit. This wireless telephone line spy circuit can be used to transmit the phone conversation to a nearby FM radio. This circuit must be...
The phone bug circuit is designed to intercept and transmit audio signals...
pippin qrp transmitter
This circuit represents a conventional Colpitts type crystal oscillator, where the output is taken from a low-value collector load resistor. Direct coupling is implemented into the base of a PNP transistor used as an amplifier, resulting in a simplified circuit...
SW Receiver Using MK414
The tuned circuit consists of a variable capacitor and fixed air spaced coil. For the coil, wound between 10 and 20 turns of wire on an empty tube of around 1.5 inches diameter. The turns were spaced so that the...
Electronic Mini Projects
The Wireless Imaging Intruder Alarm application allows home security smartphones to detect and send pictures of burglars directly to personal cell phones, PDAs, or computers within seconds of a break-in at homes or businesses when the owner is away. Code...
LW, MW and SW bands Receiver
This is a compact three transistor regenerative general coverage receiver with fixed feedback. It's based on the principle of the ZN414 only much higher coverage. The sensitivity and selectivity is relatively good (especially on the LF and MW bands) as...