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  1. nanopoylos

    ACTIVE AUDIO FILTER

    hello guys i wanted to make an active filter for my car nothing special no need to be adjustable , no need to have more gain , my car r/cd is 4 volts preout i found some very interesting chips in maxim active filters with programmable q,f0,anything i bought some ic's from maxim...
  2. nanopoylos

    RMS

    my digital multimeter is a true rms meter when i am measuring a signal 1khz 1Vpp , it does not show me the peak value , but the rms value is there any way to read the peak value? (even with the max feature on , it shows me the max RMS value , not the peak value) another problem is that with my...
  3. nanopoylos

    digitan multimeter software

    hi , i am looking for software for my protec 506 rs232 multimeter does anyone know where to find any? the stock software is very poor please help me thank you
  4. nanopoylos

    A VERY usefull circuit , but how...

    I was on a studio , and i saw a 32 channels console for recording. I noticed on EACH channel 3 leds A yellow , that showed PRESENT of signal (guess -20dB) A green that showed 0 dB signal A red (non adjustable !?) that showed distorsion , clipping So , i think , if this console has 32 circuits...
  5. nanopoylos

    Acoustic Generator

    Hi friends a very simple problem. i use a acoustic generator and i do not have the manual My generator has 1 input and 2 outputs in BNC The one output is called TTL out .WHAT IS THIS??? How does it works? The second output is the 50Ohm output. 50 ohms is its internal resistance? The input is...
  6. nanopoylos

    Pc controled fluid selector

    HI I would like to construct a device wich will have a motor,20 inputs of fluids and an output. The pc will have a programm to tell to the device wich fluid must be connected to the output each time and for how long. The selector will be in circle shape , on the one side the inputs , in the...
  7. nanopoylos

    MEASURING THD& on pc

    HI I would like to measure thd% on my pc. I use spectra plus software . If i use a low watt device, there is no problem . When i use my car cd-player , the output is 17 watts rms. So i guessed , i should protect my sound car from frying, and i used an attenuator 20db . Now the question is, when...
  8. nanopoylos

    Power supply for AMP in CAR

    HI THERE. we all know that we can build amps for home use . I would like to construct an amp for use in my car , with 12V supply . Inorder to achieve many Watts , we should raise the voltage of the car battery to 40 or ever 70 volts . As i know we should use a power converter . I would like to...
  9. nanopoylos

    control RELE by parallel port of pc

    Hi I would like to construct a device that will be connected to the parallel port of my pc , and i would be able to control RELE's . I dont know if i can find something like that ready or i should construct it from scratch . The device must be controlled by a windows programm, that i must...
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