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  1. bigkim100

    6Vdc UPS, Battery Charger for AA Batteries

    Im looking for a super simple (as simple as possible), UPS that will also charge any sort of AA batteries, to a approximate capacity of 3 amps or so. They can be Nicad, NiMH Batteries, whatever you think is easiest to use, and charge, as I have not purchased the batteries yet The UPS doesnt...
  2. bigkim100

    Multiple LED Driving

    Ok, I know how to drive individual LEDS, but when it comes to voltage and current limiting of several resistors, I dont really understand doing it correctly I have a 20 x 23cm illustration transparency in glass that I need to illuminate with leds, normally. The Illustration is divided into 3...
  3. bigkim100

    Random digital potentiometer driving

    Can anyone think up a way, using analogue electronics to randomly change the value of a digital potentiometer, and stop that value for a predetermined time. once that time is off it changes to another random value, and so on and so on... I was thinking of using the output of a 4017, driven by a...
  4. bigkim100

    Turning Motor Shaft indicator, or motor Stall warning!!!

    Ok, My landlord is a D*CK!...to put it kindly. We have ancient hot water heating in my office, with forced air by a fan. These units are as old as I am...if not older, and Im 60, and the motor for the fans, altho I have disassembled them, cleaned them, and lubricating them, they have a tendency...
  5. bigkim100

    Kims story about Gerbers, and Printed Circuit Boards

    Ok, So here is a cautionary tale of making Circuit boards.I suddenly found myself needing circuit boards. Please put the children away to bed, and close the Blinds. Ok, so as mentioned, I needed circuit boards, but I have little skills, like Gerber designing, BOTT Files and all the other stuff...
  6. bigkim100

    Can anyone create a Gerber file of the attached sloppy schematic?

    Can anyone create a Gerber file of the attached sloppy schematic?
  7. bigkim100

    Sloppy Schematic Questions

    Ok, find attached an amazingly sloppy schematic that was sent to me. My questions are: 1- What the hell are the 4 diodes doing?? 2- Overall, its a pretty simple generator, but do you think it works, as it stands?? As per usual, thank you for any help, in advance
  8. bigkim100

    2N2222 questions

    Can a 2N2222 handle driving 7 LEDs, each led in parallel, and each LED having its own 180 ohm Resistor at 6Volts?, or should I be using a Power transistor?? Thank you in advance for any assistance
  9. bigkim100

    Battery Questions??

    Im sorry, but I do not understand the chjarging of the batteries that are used in 99% of products nowsadays, and I wish to add one to a project. They usually have balance charging circuits built into the cell (at least the ones I have do). These batteries are flat and triangular, and usually...
  10. bigkim100

    hand sensor

    I would like as simple as possible circuit that can detect a human hand from anywhere from 6 to 12 inches. It needs to trigger a 555, and run on either 5 or 9Vdc. I tried the attached schematic, and unless you actually have to touch the antenna to trigger. Thanks in advance for any help, Kim
  11. bigkim100

    555 Trigger

    https://www.digikey.ca/en/products/detail/parallax-inc./29132/2696577?utm_adgroup=Evaluation%20Boards%20-%20Expansion%20Boards%2C%20Daughter%20Cards&utm_source=google&utm_medium=cpc&utm_campaign=Shopping_Product_Development%20Boards%2C%20Kits%2C%20Programmers&utm_term=&productid=2696577&gclid=Cjw...
  12. bigkim100

    I need a sensitive audio trigger for a 555.

    I need a sensitive audio trigger for a 555. I would like to use a small microphone element that triggers a 555 when the audio element is brushed or bumped. I guess it would be best if there was adjustable sensitivity for the trigger Microphone. I would like the 555 to be timing on for around...
  13. bigkim100

    Changing microphone in to Line level in??

    https://www.aliexpress.com/item/1005003243273958.html?spm=a2g0o.cart.0.0.1f4d3c00DHbk99&mp=1 This is the explanation for the board: Product introduction: Microphone - microphone front stage amplification - microphone reverberation board - power amplifier. This microphone reverberation board can...
  14. bigkim100

    Schematic to pcb layout, or Gerber

    I have a relatively straightforward circuit (in my opinion ) that I would like to make several pcbs of...even if its just the track layout, just to print out and make my own boards (with Transferrable laser paper on a copper clad board). I only need 4 or 5 boards, so I dont know if its worth...
  15. bigkim100

    How long will a 0.9ma nano motor unit last on a DCell?

    How long will a 0.7 amp nano motor run on a DCell, under no load? Thanks for any help
  16. bigkim100

    very low voltage, very low power emf generator,

    Is it possible to make a very low voltage, very low power emf generator, to test EMF Meters. It only needs a rage of a few inches. Whatcha think? Thank you for any help, in advance
  17. bigkim100

    Regulated 12v Supply, Hum reduction

    Ok, so I have my old 12Vdc 6 amp power supply, with TONs of fresh electrolytic capacitors, but Im still getting a bit of 60cycle hum. I doubt that I will ever be pulling more than 2 amps from it, but it is rated at 6 amps. Can someone suggest a choke, capacitor combo that will finish off the...
  18. bigkim100

    Power Supply

    Ok, so I need a brute force 12v 6 amp (at least power supply. I bought one for 10 Canadian Bucks at a Rummage Sale, and it outputs only 9vdc. It uses an oooold± Silicon transistor 2n6576 and a ooooold 723c control ic. Is it worth getting this thing going with a new circuit, as it has a...
  19. bigkim100

    Is there a way to EASILY slowly extinguish a LED to mimic a incandescent bulb.

    Is there a way to EASILY Low parts count) slowly extinguish a LED to mimic a incandescent bulb. Voltage used is 9VDC. Thank you very much in advance
  20. bigkim100

    555 continuous timer

    I have built this continuous cycle timer, (schematic attached) and it works, but it doesnt seem to have much range. I need the 2 cycles (ON/OFF) to be around 1 to about 5 seconds, (ON/OFF Cycles to be adjusted individually) but as it is, it seems to only have timing cycles of a second, or...
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