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  1. aimans

    transformer getting too hot.

    i was trying to determine the frequency of the a.c[ i know it is about 50-60Hz] but wanted to find it myself, and also to find the number of harmonics in a fixed length and mass[i got upto the 3rd harmonic at max. with .9m and .15kg]so i simply shorted it out, the thing got so hot that the...
  2. aimans

    IC replacment for transistor tester

    i have a CD4047 and also a 4020 IC, which one is a beeter replacement for 4027?
  3. aimans

    IC replacment for transistor tester

    what is a good replacement[if at all] for IC 4027 for the transistor tester on this site?
  4. aimans

    transformer getting too hot.

    i was using a 1500mA, 12V transformer to find the resonance frequency of a copper wire. but the transformer was getting hot too quickly, within 15mins of its running it was too hot to touch. is it because the circuit was short circuited by directly connecting to the copper wire with nothing...
  5. aimans

    Urgent help for a transmitter

    i did not use a breadboard, i made a PCB from a copper sheet, it measures 3cm x 4cm, the parts are close enough and most of the wires short. but still it is not working. i just dont get it.
  6. aimans

    Urgent help for a transmitter

    for the second circuit, i replaced 2N3904 with KN2222, and 2N3906 with MPS2907A.
  7. aimans

    Urgent help for a transmitter

    i m tryin to construct a telephone fm transmitter which connects to the phone line in series. i have used two schematics from the internet but both fail to work, i dont know what is the problem. all the soldeing and circuiting is fine. but is it because of the inductor wire? cause i am using a...
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