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  1. AnalogKid

    555 monostable on power delay

    You already have identified the C, and the R is the pot. This is a double-sided board. There might be connecting traces on the op side of the board beneath the IC. ak
  2. AnalogKid

    555 monostable on power delay

    What is this board? What is its function? Link to its product page? ak
  3. AnalogKid

    555 monostable on power delay

    Now that C4 is in place, I think C1 can be reduced 10x. The discharge problem is that when the switch (SWx?) is opened, there is not a good low impedance path from the Vcc net to GND. A solution is to add another 10K resistor to the circuit, from pin 8 to pin 1 (Vcc to GND). Now C1 will...
  4. AnalogKid

    555 monostable on power delay

    Add a small signal diode (1N914, 1N4148) across R1 (your schematic), anode to Vcc. This will create a discharge path around the 10K resistor. ak
  5. AnalogKid

    555 monostable on power delay

    There is no filter capacitor in your description of the offline power supply. Without one, the circuit is powered by rectified AC swinging constantly between GND and 12 V. That can't be good for circuit operation. If you do in fact have a filter capacitor, then your post is an excellent...
  6. AnalogKid

    small transmitters

    You also need a receiver, plus a huge amount of computing power, plus a SIM card reader or equivalent storage of user account information. I think the physical size of the transmitter portion of a cell phone is a relatively small problem to solve. The world is awash in billions of dead cell...
  7. AnalogKid

    Simple, or so I thought. Creating circuit to transform 24vac control to 12vdc.

    The TS was last here over two years ago. Better to start your own thread, and reference this one with a link. ak
  8. AnalogKid

    JFET "Amplifier". How Would This Work?

    Please post a link to the source of that circuit. ak
  9. AnalogKid

    OpAmp demystification

    For multi-pole active filters, the corner frequency of each pole usually is different. You can see that in your component values. The circuit in #2 and your circuit are different. Your circuit is a true three-pole filter, not a two-pole filter with an extra R-C tacked onto the front. Side...
  10. AnalogKid

    Need help about switch power supply circuit

    Your location tells us about the power distribution in your area, things such as average voltage, the typical voltage range, power quality and stability, etc. It also can tell us something about the electronic components andmaterials you have access to. ak
  11. AnalogKid

    Need help about switch power supply circuit

    Not in the hand-drawn schematic. ak
  12. AnalogKid

    Need help about switch power supply circuit

    Please post a link to the source of the circuit. The transistor symbol has no indication of its polarity - NPN or PNP. Also, which side of the schematic is the input, and which is the output? ak
  13. AnalogKid

    Problem in charging 450v 680uf capacitors at the same time

    Please post a schematic of your circuit. Note that if you are drawing 5 A from a 16 V battery, that is only 80 W. After the inefficiencies of the inverter, that leaves around 50-60 W at the inverter output, only about 1/4 A at 220 V. A bank of discharged capacitors will draw way more than...
  14. AnalogKid

    Want to copy ultrasound tooth regeneration device.

    Since others are jumping on a 5 year old thread, so will I. That is conspiracy thinking. If this worked, it would completely take over the market. Nothing is more guarantee-profitable than obsoleting needed standard equipment with new equipment. ak
  15. AnalogKid

    74LS160 COUNTER - 0 to 999999

    In the upper schematic, you have Vcc dead-shorted to GND. Also, the six WR- inputs are connected together, but that net is not connected to anything. ak
  16. AnalogKid

    74LS160 COUNTER - 0 to 999999

    Another hint, just so you know the size of the final circuit - you are looking at around 15 IC's. ak
  17. AnalogKid

    How to boost 2v - 4v, 50mA - 100mA to 5v 500mA?

    The product page says the conversion efficiency is 97.5%. It is not. That is a theoretical maximum based on a specific set of input and output conditions, *none* of which is specified. It should be able to deliver 80% efficiency, but as above, 87% will be tight. ak
  18. AnalogKid

    In need of direction...

    The delay part can be as simple as 1 resistor, 1 capacitor, and 1 small MOSFET. But The light will not snap on after the delay, it will come on slowly enough to see that it is coming on slowly. If you want it to snap on crisply after the delay, then for a simple one-off project I would go...
  19. AnalogKid

    In need of direction...

    How long a delay? User-adjustable? Led part number / datasheet The switch action you describe is called alternate-action. This can be done mechanically in the switch, of with an electronic circuit that takes closures from an ordinary momentary switch and produces a signal that toggles on and...
  20. AnalogKid

    Basic transistor switch

    Back in my PIC days . . . I won't say it was the hardest part, but the part I least looked forward to was figuring out all of the register configurations at the start of a project. Yuk then, yuk today. ak
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