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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 nettron1000

  1. N

    fixing wheels

    Its best to use a wheel hub that has a set-screw for fastening the wheel to the shaft, another option is to use a cotter pin inwhich you have to drill a small hole thru the shaft.
  2. N

    Old ROBOTARM

    I second that, heres my circuit: http://www.geocities.com/nettron1000/ParaPort3.html
  3. N

    I wanna make a body heat detector

    Ever heard of night vision goggles or scopes ? Getting the parts to build one would be quite expensive.
  4. N

    Positive n negative feedback

    The emitter resistor (R2) provides a degree of feedback.
  5. N

    Help With Parallel Port

    You can connect the LEDs to the parallel port pins like this : http://www.hut.fi/Misc/Electronics/circuits/lptleds.gif
  6. N

    frequency counter

    Have you considered using a 7208 frequency counter IC ? Its not a stand alone solution but the 7207 IC that generates the timing waveforms and frequency division for the 7208 is only a 14 pin dip and most of the pins are not used. Also the 7208 can multiplex seven 7-segment displays(common...
  7. N

    Voltage polarity indicator help

    Appears to be a good app for a comparator IC such as a LM339, heres a link to some info. **broken link removed**
  8. N

    car starter moter mod

    Dstich, if you have access to an auto scrap yard go for the wiper motors and some vehicles have power window motors, obviousely both can go forward or reverse (cw,ccw).
  9. N

    building a logic probe

    Heres a link to a TTL logic probe i designed and built a few eons ago in which the high/low LEDs light up only when the probe is connected to the point under test ( that may be what Sam means by "tristate"). The circuit has the added advantage of displaying the letters "H" for high or "L" for...
  10. N

    Can't find 60Hz Oscilator!

    Or use a MM5369 IC as the 60 Hz source, these are very accurate and use a commonly available 3.58 Mhz TV colorburst crystal.
  11. N

    inverter circuit for computer light

    Are you sure Tansis ? thought the voltage was alot higher than that, something like 300 V or so, depending on the length or something other.
  12. N

    inverter circuit for computer light

    The circuit wont work as shown in your diagram. The CC light should be placed in series with the transistor. The transistor is acting as a switch.
  13. N

    Computer port control, but which 1?

    I think the parallel port is easier to work with. Well i guess im biased since its the only port ive ever used in my robotics apps, but doesnt the user have to consider baud rate and handshaking when programming for the serial port ?
  14. N

    need software to generate schematic and/or PCB

    https://www.expresspcb.com/
  15. N

    Question about AC currents and Live and neutral wires.

    No torture ? To get a simpler understanding of neutral think of it as the center-tap of a transformer.
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