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  1. Einstein Jr.

    Transistor As Switch Variation

    I want to make an mp3 player whose volume level increases when there is external noise. I was thinking of using a transistor as a switch by putting 9 volts in the collector and attaching a microphone negative to the base and posistive to vcc supply. When there is enough current from the...
  2. Einstein Jr.

    Using all four amplifiers in an LM324

    I would like to use the LM324 quad amp for a project. For maximum amplification I would like to use all four amplifiers. How should I wire it so that the output of the first amp will be fed into the next for all four. What is being amplified is a condenser electret microphone.
  3. Einstein Jr.

    Voltage Regulator Question

    Hi again: I have a voltage regulator like this: http://www.amazon.com/pieces-TO-220-Voltage-Regulator-L7805CV/dp/B007JXYH28/ref=sr_1_5?ie=UTF8&qid=1415121405&sr=8-5&keywords=5v+voltage+regulator. If I were to use this for a charger for phones do you know if this would work? And If so do you know...
  4. Einstein Jr.

    How to wire 5 pin Jack

    Hi again! I have a project that amplifies a certain sources sound and feeds it to a jack. So I have two wires for attaching to the jack: ground and the signal wire. The jack is this one...
  5. Einstein Jr.

    Prevent Close Range Noise

    Hi, I am building a bionic ear sort of circuit with an lm386. However, I only want to hear far away noise instead of close noise. Is there anyway to do that with some sort of filter or something? Any help appreciated. This is the link to what I am building...
  6. Einstein Jr.

    Simple Short Range FM Transmitter

    Hi, I am trying to make a short range(around 50 - 100 meters) fm transmitter and found this simple one on the web(simplest transmitter.png). I want it to have different input options 1. the jack, 2. regular microphone, and then I wanted to have a sonic ear type amplified mic for the third...
  7. Einstein Jr.

    Adjust the range of Transmitter

    Hello, everyone! Does anyone know how one would be able to use a variable capacitor or potentiometer or something of that nature to adjust the range of an FM transmitter. Attached is the circuit.
  8. Einstein Jr.

    Use diode to attach multiple circuits

    Would it be possible to use a diode to attach to circuits together in order that circuit A would not flow into any of circuit B's pieces but B could use A's (in this case an anttena.)
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