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  1. K

    Soft latching power switch

    Been rethinking (3AM) my suggestion. It might be OK. There might be a very small continuous uA leakage current when off, but that may not be a problem for you. The fact that there is a 100K resistor from source to gate would probably keep the MOSFET off even with a high resistance current path...
  2. K

    Electronics engineering

    Don't eat at a place called MOM's, don't play poker with a man called Doc, and don't ask "what do I need to know" on a Forum. ;) Ken.
  3. K

    Soft latching power switch

    Yes. :( Ken
  4. K

    Soft latching power switch

    The issue is, I don't know the state of the I/O's when the micro is off. If there is even a high resistance path through them to ground, this approach might not work. With the power off and without the diodes, measure the resistance from D4-6 to ground. If there is any readings, this approach...
  5. K

    Soft latching power switch

    I'm thinking you will want the wire (with the arrow) to go to the three switch inputs through diodes. Anodes toward Q2. This isolates the switch inputs from each other. I assume the micro has "weak pullups", as the schematic doesn't show external pullup resistors. Do they say how they program...
  6. K

    Soft latching power switch

    You didn't say what microcontroller you are using. I have used a P-MOSFET and an N-MOSFET to make a Push-ON/Push-OFF or Push-ON/Program-OFF switch for PICAXE's power. Here is a link to links discussing on how to do this...
  7. K

    Need help for Free massages...in a chair...but it pays :D Whaaaaa?!?!?

    Now you may start to see why people charge so much to design something "simple". ;) Ken
  8. K

    Need help for Free massages...in a chair...but it pays :D Whaaaaa?!?!?

    OK, I think I mis-interpreted your concept. Sorry. You want to replace the cash input with the manual switch input and count it's pulses. Not too complicated A 555 to flash the switch lamp. Only when the chair is not in use, or all of the time? A 555 monostable to debounce the switch an provide...
  9. K

    Need help for Free massages...in a chair...but it pays :D Whaaaaa?!?!?

    You are going to need a microprocessor with a 5V supply and preferably a battery backup. This to handle all of your requirements, Probably a small 18-pin one with a 2-digit 7-segment display will do it all. like this: http://www.8051projects.net/pic_tutorial/programming-example.php But that...
  10. K

    5 pin relay weirdness

    http://en.wikipedia.org/wiki/DIN_72552 Ken
  11. K

    Moisture Sensor

    link to the GSM modem would help. Ken
  12. K

    Need help for Free massages...in a chair...but it pays :D Whaaaaa?!?!?

    It will depend if someone wants to do it out of curiosity...because a few dollars or "BRAGGING RIGHTS" won't draw anyone. Designers would ask $75 to $150 an hour. Ken
  13. K

    Need help for Free massages...in a chair...but it pays :D Whaaaaa?!?!?

    Can you provide the wiring for the chair and cash controller? Ken
  14. K

    Detection of cigerette smoke

    Prices: http://www.catchasmoker.com/nt-prices.htmhttp://www.catchasmoker.com/nt-prices.htm :eek: Ken
  15. K

    Safety measures when working with electronics?

    When working with higher voltages (>48V), keep one hand in your pocket. I know that sounds silly, but it can save you life. The idea is that in case you inadvertently touch a high voltage source, there won't be a path across your chest, through you heart, to the low side of the source or...
  16. K

    How to make a rotating socket?

    You did notice that the link was to a 2 Amp slip ring? Ken
  17. K

    How to make a rotating socket?

    What voltage and current? Google: power slip ring You'll find ones like this: http://www.adafruit.com/products/736?gclid=CNb9j7zPhcUCFZGDaQod4RQApA Ken
  18. K

    Ideas

    You're going to need to know how much current your motor and receiver are going to draw to get an idea big a battery you are going to need. I would use an 8-pin PICAXE microcontroller (just my favorite for one-offs) and a stepper driver board like this: https://www.pololu.com/product/2134 Ken
  19. K

    Turntable strobe

    There are tutorials on using breadboards. Google: using an electronic breadboards Ken
  20. K

    increase 12v DC motor start torque?

    That would work. You would need a timer driving a SPDT relay. Or maybe a solid state switch, as the relay's switching time might cause a temporary dropout as it switched from 24V to 12V. I can't say that 24V for a short burst is OK for your motor though. Ken
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