3V FM Transmitter Fm Transmitter 88-108MHz

Tester For Remote Control Here is a simple tester for checking the basic operations of an infrared remote control unit. It is low cost and easy to constuct. The tester is built around infrared receiver module TSOP1738.

WinCircuit is a software of realization of drawing of printed circuit in single or double layers. Principal qualities are the facility of use and the sight in pseudo 3D which gets a vision of the circuit close to reality. Pad round or square of adjustable size per step of 0,254mm Track adjustable width by step [...]

How to enter service mode — chassis 5N11, 5P60 ,14/21S01

The circuit presented here is a very useful add-on device to be connected to the telephone lines to count and display the number of incoming calls received in the absence of the subscriber. The circuit can be fabricated using low-cost and easily available components. It uses a popular decade counter ic, a timer ic, and [...]

FD-SWM-VHF Measuring SWR at VHF/UHF frequency was never a fun. Most radio amateurs just assume that their 50 ohms cable is matching a beam or GP. SWR Meters of analog variety are flooding market, although, not very economical. LCD meters are bit expensive, crossing a range of over $100. Although, even if they include “Antenna [...]

This Power Supply puts out 22[Volts] by max. 4[A]. Be sure you use the right transformator 30[Volt] at least 130[Watt]!!! Also make sure that all capacitors can handle the delivered voltage, see schematic 63[V] will do. Allthough one TIP2955 can deliver almost 10[A] (when oversized cooled) it’s better not to go beyond 5-6[A]. To prevent [...]