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  1. audioguru2

    i need help extending the keys finder project. can someone help me out????

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  2. audioguru2

    i need help extending the keys finder project. can someone help me out????

    Hi Logan, Here is a schematic of the original circuit with its CD4049, with three tiny button battery cells and driving a blue or white LED. You will probably add a switch so that the LED can be turned off and turned on by itself.
  3. audioguru2

    Basic amplifier

    The circuit's "volume control" adjusts the amount of smoke from the transistor. ;D
  4. audioguru2

    power saver schematic diagram

    What help is needed? Did you overload ithe circuit and burn it out? Doesn't the circuit "save power"? Doesn't the motor run properly with this circuit messing with its current?
  5. audioguru2

    Transformer problem

    What is hot? Did you look at its ratings on its datasheet? Something is drawing too much current. Current times voltage makes heat. What gets hot or its load is drawing too much current.
  6. audioguru2

    Low-pass Filter?

    I don't know if a computer's power supply will work from a square wave. I wouldn't use a simple low cost inverter on my computer. Your transformer is probably rated as a voltage step-down transformer with a small 24V/2A output. That is only 48VA. A 480VA inverter will draw 40A from 12V and...
  7. audioguru2

    Transformer problem

    The difference of the transformer's voltage and frequency outputs are small and it should work. You need to troubleshoot the circuit to find what overheats and stops the circuit.
  8. audioguru2

    about mixer

    Ane, You are posting the same topic twice! Please continue replying in your 1st thread. I answered you in this topic: http://www.electronics-lab.com/forum/index.php?topic=5711.msg36102;topicseen#msg36102
  9. audioguru2

    Low-pass Filter?

  10. audioguru2

    about mixer

    Inputs at V1 to V4 don't have much gain by A1 and A3 so the inputs are for line-level sources like MP3 and CD players or a radio's tuner. No. An opamp isn't powerful enough to drive a speaker, and a volume control would melt if a speaker was connected to it. This mixer circuit feeds a power...
  11. audioguru2

    Low-pass Filter?

    If your transformer's 24V output is rated at only 3A then the transformer's max rating is only 72 VA. Using such a small transformer in a 500W circuit wastes many parts. Just the operating power of the circuit without a load will probably overload the transformer. Here is the modified project...
  12. audioguru2

    Low-pass Filter?

    With a 14V fully charged car battery, one 12V wire of the transformer will be driven to about 2V and the other 12V wire will swing to 26V. Then the oscillator reverses the voltages. So each transformer wire has 24Vp-p when measured from the 14V center tap. If you connect the high voltage...
  13. audioguru2

    Low-pass Filter?

    The project doesn't have a regulated output voltage. It will change with the load.
  14. audioguru2

    Low-pass Filter?

    I don't know what your transformer is connected to. The mains? The project? I don't know what was not connected to a transformer yet. The project produces a square wave output that most meters won't measure accurately.
  15. audioguru2

    i need help extending the keys finder project. can someone help me out????

    As I said before, I don't think a CD4049 will work in this project. It has a very high current and is not symmetrical to be used as linear amplifiers. The LR41 is 1.5V when new and is guaranteed to produce 1.3V into a 100 ohm resistor (13mA) for only 0.1 second to 2 seconds. It is designed for a...
  16. audioguru2

    stun glove

    If it was rated at 0.8A then it would say so. Your schematic says 8A. Did you use a little 9V battery? It hardly has any current. It has tiny AAAA cells inside. Did you build 100 voltage multiplier stages? Each stage divides the current. Nearly no current divided by 100 equals nothing. 12kV...
  17. audioguru2

    Low-pass Filter?

    For the modified 500W inverter project the 1N5401 diode is rated for 100V/3A so will be fine for D1 and D2. No. The primary has 24Vp-p so the transformer should be rated at 12V - 0V - 12V which is 24V center-tapped.
  18. audioguru2

    stun glove

    Ridiculous. A little 9V battery will supply only about 200mA to the circuit and its voltage will drop to about 6V. The 6V at 200mA is stepped-up by the transformer and 100 voltage multiplier stages to 12kV at only 100uA if it works perfectly without any loss. Your schematic shows an output of...
  19. audioguru2

    i need help extending the keys finder project. can someone help me out????

    Hi Logan, I think that the gain of the mic preamp is so high that its wiring would pickup mains hum if it was on a breadboard. Your CD4069 IC was faulty or the breadboard was faulty because when you grounded the inverter's input pin 1, its output pin 2 stayed low instead of going high which...
  20. audioguru2

    i need help extending the keys finder project. can someone help me out????

    It would need to be re-designed to operate with a 3V supply. Its supply current would quickly kill a small battery.
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