The KA7OEI FT-817 Schematic diagrams
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#schematic
#radio
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Wireless mains voltage tester
This circuit is designed to test the presence of mains voltage without direct electrical contact with the mains line. The core component of this circuit is the CMOS IC CD4033, which features a five-stage decade Johnson counter and an output...
QRP CW TRANSCEIVER
This is a 3-W, single-circuit board, VFO-controlled CW transceiver for 40 or 30 meters, featuring a direct-conversion receiver with audio filtering, Receiver Incremental Tuning (RIT), and speaker level audio volume. The transmit frequency is generated by Q1 and its associated...
SV3 Radio Magnadyne Radio
Most models produced in the 1930s utilize similar circuits, particularly in the RF section, which follows a common LW-MW-SW scheme. Variations among different models primarily stem from the inclusion or exclusion of variable selectivity control, the sophistication of tone controls,...
Car wireless alarm
This FM radio-controlled anti-theft alarm can be used with any vehicle having a 6- to 12-volt DC supply system. The mini VHF, FM transmitter is fitted in the vehicle at night when it is parked in the car porch or...
Latest Wireless Car Alarm circuit diagram and explanation
This circuit is a wireless car alarm system composed of two modules: a transmitter and a receiver. It operates using FM radio waves and is compatible with vehicles that have a 6-12V DC power supply. If the vehicle's power supply...
ic718
Modification of the Icom IC-718 Transceiver for Automatic Link Establishment (ALE), to deactivate the transmit bandpass relays during receive and scanning.
The modification of the Icom IC-718 Transceiver for ALE involves a specific alteration to the circuitry that controls the operation...
Wireless two-tone electronic doorbell circuit diagram
The transmitter circuit is activated by pressing the SB button. Components D1, D2, R2, R3, and C4 form a low-frequency oscillator that controls an audio oscillator made up of D3, D4, D5, and D6, allowing them to operate alternately. The...
10 GHZ Transverter
A number of amateur radio operators have begun their journey in the 10 GHz band using surplus microwave transceivers manufactured by M/A-Com, commonly referred to as "White Boxes." These devices can be modified to function as transverters, which convert signals...
Video/Audio Wireless Transmitter
In this fast-paced world, there is little time for inconveniences and a greater need for portability and adaptability. The idea for an Audio/Video transmitter stems from this need. There may have been times when you’ve wanted to hook up your...