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 [...]

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TIREAL TFT Test description TIREAL TFT Test – Compact program for fully testing and configuring your LCD-TFT monitor TIREAL TFT Test is a compact application for fully testing and configuring your LCD-TFT monitor. Tests: – Base color test – Interference and video noise test – Grayscale test – RGB test TIREAL TFT TEST 1.1.rar

Parts List: 2470 pF mica capacitor C1, C5 175 pF mica capacitor C2 139 pF mica capacitor C3 112 pF mica capacitor C4 20.001 uF disc or monolythic capacitor (marked either 102, .001, or 1n) C6, C8 20.1 uF disc or monolythic capacitor (marked either 104, .1, or 100n) C7, C9 110 to 22 uF [...]