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  • Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.

Recent content by ag

  1. A

    music analogue circuit analysis

    I need help understanding this distortion circuit. I don't know about how much signal feedback is going into the second transistor. I also don't understand the difference in the effects of the comp and volume knobs. Finally, this circuit oscillates at certain settings, but I don't know which...
  2. A

    generating even harmonic distortion...

    Yeah, distorted audio but max even harmonics, minimum odd. It's for a 4 band EQ. I'm trying to get a tube sound with solid state parts.
  3. A

    generating even harmonic distortion...

    ok, will do.
  4. A

    generating even harmonic distortion...

    ...whats the best (low voltage) way of doing this?
  5. A

    help with guitar 'gate' effect

    damn, actually i can see a way to achieve what i want - with a tempo clock clocking a 4 bit counter controlling a 16 to 1 MUX. moral of the story: keep it is simple, don't assume the answer to everthing is a pic!
  6. A

    help with guitar 'gate' effect

    i'm using a 16f873A PIC with 2 8-bit DIP switches connected to ports B and C (inputs). One of the pins on port A is connected to the gate of a FET, which forms part of a variable gain circuit through which the guitar signal passes. my plan is that the user sets each of the 16 switches to 1 or 0...
  7. A

    Need help with dsPIC ADC in/ PWM out

    I've got a dsPIC (33FJ256GP506) with a microphone input circuitry connected to pin AN0. Also there is audio output circuitry connected to pin OC2/RD1 - thes audio will be output via PWM. I'm a total beginner at setting the config bits and flags for the ADC and PWM. What C code would take a...
  8. A

    dspic starter kit

    I decided to jump into microcontrollers at the deep end and get the dsPIC starter kit 1.1. I have only written basic code for the 16F series (blinking leds, that's about it), so I may have bitten off more than I can chew, learning curve wise. I have programmed FFT algorithms before, though...
  9. A

    Recharging Sealed Lead Acid batteries - frequently

    My electric bicycle has three 12v sealed lead acid batteries powering its 200w motor. The bike weighs a ton for this reason but I don't need to pedal, I just use the throttle and I can go pretty fast, even uphill. Apparently it can do 15 mph without pedalling. The batteries apparently last...
  10. A

    Make money from home w/ electronics?

    I know there are people with a lot of good ideas here so I thought I'd ask for any thoughts on this. I'm an electronics graduate but I'm chronically unwell and basically housebound. I was tying to think of a way to use my knowledge and low cost equipment to generate some sort of income for...
  11. A

    'best' field?

    this has probably been on a thread before but what do you think is the field most recommendable as a specialism with the way the industry is headed just now? VHDL with control theory or communication systems theory? Or microcontrollers with control/comms? I know microcontrollers in general kick...
  12. A

    getting an electronics job

    Finished my electronics degree (yeah!) only to realise how incredibly difficult it is to find a position anywhere, considering a complete career change altogether if things don't start happening soon. Has anyone else been through this and how on earth did you manage to get your job :? ?
  13. A

    if you transmit at wideband frequency will narrow band frequ

    :shock: :? :o
  14. A

    8 bit counter using two 4 bit counters

    connect the 'carry out' pin of the first to the 'clock' / 'count' pin of the next. When the first counter "overflows" ie is "1111", the carry bit will change to "1". If you don't have a carry bit use a 4 bit AND. Basic logic.
  15. A

    Programmer board not detected on USB port

    No, it didn't ask me for the windows CD. It's MPLAB v5.70, but there's a separate program (PICkit v1.0) for loading the compiled program into the development board and it's that part which if i'm right should be communicating with the board.
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