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  1. trigger

    sram controller

    I think build your own IDE interface from scratch isn;t that easy...... may be you can consider to use some interfacing chip .....
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    call timer for mobile phones

    Please noted that the cell phone does not transmit RF signal continuously during calling...... thus you cannot use the RF signal as the indication of call time..... just my opinion. ;D
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    Improvised movement triggerd switch

    For a movement trigger switch, I think you can disassemle a sport step-counter (hmm...... some of them use mercury switch or magnetic switch, but nowadays most use an arm+drum+spring wire due to thier low cost) and take out the mechanism......... I will take a picture of that mechanism later...
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    fast switch-off for transistor switch

    Thanks audioguru, that takes my a lesson to learn :) Actually, I know the problem as the circuits will gives me a blinking while the DC level is about the threshold level..... so finally I come up with a schemitt trigger circuit to have a voltage comparison, and give either a logic 1 or 0 to...
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    Playing with hydrogen

    That reminds me my old time in primary school............ I disassembled batteries and take out the graphite, connected two with supply and dipped into a cup of salt water...... I used test tube to fill with hydrogen and oxygen come out from the graphite.... My game is lite a match to make a...
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    fast switch-off for transistor switch

    I think TRIAC + DIAC can do the high voltage switching without a spark....... I have done projects in 100W light bulb switching using LDR as sensor at 220Vac. The switch on and off depends upon the DC level to the DIAC. So if needed the circuit I can draw them out........ (or you can google...
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    Your PCB partner who located in China

    Seems your company located in Hong Kong, just as I do.......... So will you be able to provide PCB samples ordering....... (without Mass production.......)
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    ultrasonic mosquitoes repeller

    ........... ah......... who knows...... just it comes with a pack of batteries as an add-on gift but I will try check its output frequency
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    ultrasonic mosquitoes repeller

    I have disassembled a cheap mosquitos repeller. it just use 2 transistors, a few R and C, and a piezo buzzer.... May be later, I trace and draw the circuit out....
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