Electronic Project | Electronics Repair And Technology News

How To Test PWM Gate Drive Signal Pulse Using Single Bright LED

Jestine Yong — Sat, 22 Mar 2025 05:46:19 +0000

It is difficult to check PWM IC working in SMPS without Oscilloscope. Came across trick for testing which give us indication if PWM generating Gate drive signal pulse or not. Reference Circuit for SMPS Switching: First of all, remove the mosfet from the Circuit under test & connect the LED […]

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Nostalgic And Fascinating AM RADIO From A Single Chip TA7642!

Jestine Yong — Wed, 23 Jun 2021 04:20:12 +0000

I take a break once in a while away from my monotonous service work and involve myself in assembly. I think I can comfortably say that Radio is as fascinating today as it was when invented. I had downloaded the following circuit diagram and read other articles in the […]

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Making A Working Jim Williams Based Pulse Generator

Jestine Yong — Fri, 18 Jun 2021 03:49:11 +0000

Recently I started making one of those famous Jim Williams based avalanche fast rise pulse generators. I therefore bought a set that consisted out of 3 OSH PARK pulse generator boards. And all info including the part list was given on the OSH PARK website on https://oshpark.com/shared_projects/KrhgN8JM . Previous OSH Park schematic version 2.4 was […]

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Do It Yourselves (DIY) AC Extension Box

Jestine Yong — Tue, 04 Sep 2018 12:30:37 +0000

Time and again, one or other tools as well as the facilities that we have in our workshop fail, putting our service work to jeopardy. Such a thing happened, when one of the Chinese Made extension boxes short circuited and started burning inside. Luckily, […]

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How to Build a DIY Fully Automated Light Controlled Fan Regulator

Jestine Yong — Mon, 06 Jul 2015 03:05:46 +0000

The Life of an electronics repair engineer is not always about repairing something that is broken. Or about something that needs to be replaced to fix a device. Sometimes it is also about fixing a problem by designing something that still even doesn’t exist. This article is […]

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Homemade Power Box

Jestine Yong — Sat, 02 Aug 2014 08:25:30 +0000

If you have read Gerald Musy previous article about Light Bulb (click the below link) https://www.jestineyong.com/light-bulb/ I’m sure you have noticed a power box was used to plug in the load (light bulb) and gain access to voltage and current test points. What is exactly inside the power box and […]

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Curve Tracer Project

Jestine Yong — Mon, 20 May 2013 04:13:22 +0000

If you wish to build your own test equipment then you can try build this advanced curve tracer tester provided by a website from Thailand. There is also a simple curve tracer project. Please click on the photo to visit the website. Likes(6)Dislikes(2)

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Long Rang IR Beam Cut Detector Circuit

Jestine Yong — Sat, 11 Jun 2011 12:53:25 +0000

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Incircuit Transistor, Diode and SCR Go-No/Go Tester

Jestine Yong — Sun, 05 Jun 2011 12:10:22 +0000

Another hour i will be on my way for the holiday so just before i go here is the website link (please click on the photo) to build the Incircuit transistor/diode/SCR tester. This website was recommended by Brozik. The schematic is very clear and you should have no problem in building one. Likes(4)Dislikes(1)

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FET Tester

Jestine Yong — Thu, 31 Mar 2011 23:51:15 +0000

My ERG member (Mr Eric) had successfully built the FET tester from the January 2011 monthly repair newsletter which was contributed by Mr Beh from Iran. If you have not sign up for my monthly repair newsletter you can visit THIS link to sign up for free and enjoy the repair articles. Here are the […]

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