Surveillance Transmitter Detector
#surveillance
#transmitter
#detector
#RF detection
#security
#wireless
#signal detection
#spy equipment
#monitoring
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Transmitter Negative Key Line Keyer
Using an NTE288 (or ECG288, GE223, or SK3434), this circuit can key a negative line up to -300 V maximum. Do not use this circuit to key a vacuum-tube amplifier that draws grid current because the keying transistor might be...
Electronic Locker Guard
Protect your locker or briefcase from theft using this pocket-sized gadget. It emits a loud police siren to attract attention. The circuit utilizes a single integrated circuit (IC).
This circuit is designed to provide a compact and effective security solution for...
Wireless Car Alarm
This circuit is a wireless car alarm system that consists of two modules: a transmitter and a receiver. It operates on FM radio waves and is suitable for vehicles with a 6-12V DC power supply. A voltage stabilizer can be...
Wireless Auto Tachometer
Anyone performing their own automobile tune-ups knows how important it is to know your engine's speed. With this tachometer, you can measure your engine's speed without any connections or annoying timing lights.
The described tachometer is a non-invasive device designed for...
Precision QRP Transmitter
This compact transmitter is suitable for less demanding Doppler propagation measurements. It is designed for operation on the 80m band but can be easily adapted for the 40m or 20m bands. The output power is approximately 500mW of unmodulated carrier,...
valved transmitter for 3.5 MHz
This transmitter project is a highly efficient, rugged, and simple low-power continuous wave (C.W.) unit delivering more than 10W. It is crystal-controlled with stabilized high tension (H.T.) and features a buffer stage between the crystal oscillator and power amplifier stages,...
tv transmitter circuit
Here is a simple schematic of a TV transmitter circuit, or video transmitter circuit, capable of broadcasting in the VHF range from 60 to 200 MHz. The input video source can be any CCD camera or VCR. The output power...
AM FM Simultaneous Transmitter Using Digital ICs
An FM and AM transmitter integrated into a compact device utilizing the CD4001 integrated circuit. It broadcasts at 20 MHz for AM and 100 MHz for FM.
The described transmitter combines both Frequency Modulation (FM) and Amplitude Modulation (AM) capabilities into...
Schematic Diagram Anti Theft Car wireless alarm
This is an anti-theft alarm with wireless connectivity, referred to as the Anti-Theft Car Wireless Alarm. The FM radio-controlled anti-theft alarm can be utilized with any vehicle that operates on a 6 to 12-volt DC supply system. The mini VHF...