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    Notes on the Link intercom

    pls, I've seriously  been battling with d "4+0 Link Internal Intercom"design. I don't know if anyone has constructed it also to noty me of any modification. I couldn't get MC145436, I'm using MT8870C in place. Also, I dont know if IC3 should be CD4514 or CD4515 (as the latter has low output on...
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    POWER PACK DESIGN- Help!/ Xtal Oscillator

    pls, I wish to design a 30Vdc 500mA for my Printer. Pls help with all deatials. Also, pls does a crysta oscillator have a polarity?
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    Intercom cct:Any Error?

    thanks for ur usual assistance on my project:"4 Link Intercom" at http://www.electronics-lab.com/projects/telephone/015/index.html. Pls, I want to confirm d following: a.) Is there any common connection between the two resistors labelled R9, R10 and the capacitor C4 at the DTMF input (I mean...
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    ICs & Audio Transformer needed!

    Pls,  I need information about where to get an audio transformer wth 1k/8R centre-tapped at IK wnding and the following ICs: MC 45436 DTMF Decoder CD 4515B 1 of 16 decoder CD 4013B dual RS flip flop Pls, I want a place where small quantity supply order can be placed. lanre Nigeria
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    Datasheet & Components-Urgent!

    Hi, Pls, I urgently need the datasheet as well as possible place to get these  ICs (or thier equvalents) required to carry out the project below http://www.electronics-lab.com/projects/telephone/015/index.html MC 45436 DTMF Decoder CD 4515B 1 of 16 decoder CD 4013B Dual RS flip flop I also need...
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    The Link 4+0-Internal Intercom-Help me out!

    Pls, the ICs (MC45436 DTMF decoder, CD 4515B 1x16 decoder and CD4013B RS flip flop) required for the above project are just too scarce. I searched the web and even for the datasheets and possible replacement all to no avail. The replacemnts gotten from the market didn't satisfy me with their...
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    The Link 4+0-Internal Intercom-Help me out!

    Concerning the schematic of the above project which I intend doing, am still havng some problems: Is there any alternative to the audio transformer (impedance-matching xformer)used in the project? And is ther any common equipmnt where I can see a sample to remove it from the scrap? Is that...
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