Sabtu, 30 Juni 2012
Kamis, 28 Juni 2012
Simple Nicad Battery Charger
This simple charger uses a single transistor as a constant current source. The voltage across the pair of 1N4148 diodes biases the base of t...
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High Current Power Supply
Since my page was first posted, I have received a number of emails asking about a high current power supply. I looked around, but couldn...
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Sabtu, 16 Juni 2012
Running Message Display Schematics Circuit
Light emitting diodes are advantageous due to their smaller size, low current consumption and catchy colours they emit. Here is a running me...
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Kamis, 14 Juni 2012
Dual Mode Battery Charger Circuit
There are two main types of battery charger – constant voltage and constant current. Both have their advantages and disavantages. For consta...
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Kamis, 07 Juni 2012
Simple FM Microbug
Although the idea has been around for a good while already, it’s still cute: a tiny circuit that you can hide just about anywhere for all so...
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60W Inverter using transistors
Here is the circuit diagram of a fully transistorized inverter that can drive up to 60W loads. Transistors Q1 and Q2 forms a 50Hz astable mu...
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