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    Speech Recorder

    Hi all, I have a problem here. I'm using ISD2548P as a speech IC to record the messages that i need to use for my project.I follow the PUSH BUTTON circuit that provided in the data sheet to record the messages.I try to record and play the speech but nothing can be heard when i play it. :-\...
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    ringing detection circuit

    Hi all.. I have a problem here. i tried to build a ringing detection circuit. But when i connect the ring and tip of the telephone cable to this circuit,i found out that it automatically being off hook. As a result,it cant be used to detect the ringing signal and it get engaged when i call to...
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    Far-distance remotely controllable rectifier with back-up battery

    Hi all.I found a circuit which basically works like this... A replaceable and rechargeable back-up battery and a ring-controlled switch circuit are provided to the rectifier of this invention to keep the machine working in case of an unexpected failure of the civil power or in response to...
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