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  1. AnalogKid

    micro seconds

    b. ak
  2. AnalogKid

    Need professionally made circuits to control heaters using PWM and MOSFET

    Many people on this forum have the tools and experience needed to do this, but you won't get any useful feedback without posting the schematic. Also, what is the environment for the resulting product? Indoors / outdoors / extreme cold / no ventilation / power source / etc? ak
  3. AnalogKid

    Regarding the IC

    Not without a show of some effort by the OP. ak
  4. AnalogKid

    LED FLASH/ON

    True, and I don't know how it will respond to a slowly-changing input. But some combination of LDR value, series resistor value, and light level will cause a state change. With so little to go on from the OP, it's seems like a less complicated starting point. ak
  5. AnalogKid

    Regarding the IC

    There are many app notes that show how to add a winding to the inductor in a buck regulator to give a second output that can bee either positive or negative. ak
  6. AnalogKid

    LED FLASH/ON

    Or use a 555 as the flasher, and connect the LDR and a fixed resistor as a voltage divider with the center connected to the 555 reset. Since the 555 can drive an LED while in thee reset state, this should meet both operating criteria. ak
  7. AnalogKid

    How can I remove the underling waveform from a signal

    One way to view what you have is a differential signal with a large and varying common mode component. Older scopes have two useful buttons. One inverts one channel but not the other, and the other button sums the two channels. With the two scope channels on A and C, invert-and-add will...
  8. AnalogKid

    led driver selection for project

    It might be a single series diode for half wave rectification. I'm having trouble with it being the only component on the bottom side of the board, and expensive manufacturing step. Any chance of a bottom-side view? ak
  9. AnalogKid

    Getting additional voltage/power to pc water pump

    It will if it is a 3 A diode.
  10. AnalogKid

    led driver selection for project

    My bet is there there is no reverse voltage protection on the pc boards. The current limiting resistors are so large that even if the diodes go into reverse conduction the current is limited to a safe value. ak
  11. AnalogKid

    Help please, im lost

    This is a voltage regulator circuit with many of the components unspecified, so there is no unique solution set of component values and circuit parameters. As a starting example, there is a zener diode and a resistor to bias it. What is the zener current? Don't know, and within reason don't...
  12. AnalogKid

    A Control circuit's Vcc

    1. Is the boost converter isolated or non-isolated? 2. If the input can be up to 100 V, what is the output voltage and current? ak
  13. AnalogKid

    simple differential circuit

    Why? School assignment?
  14. AnalogKid

    Getting additional voltage/power to pc water pump

    GPG is correct, the most simple way will require two diodes. The +5 V and +12 V diode-OR into the fan. This way the +12 V does not try to pull the +5 V up. This method works only if the +12 V source can be programmed down to 0 V (or at most 4 V) when in the unused state. PWM is more complex...
  15. AnalogKid

    Need some guidance with relays and timers

    There are three basic ways to do this. You can buy industrial timer modules, the kinds of things in industrial control panels that wire together; or buy a programmable timer pc board device from china on ebay for around $12, and a small power supply for it and a small solid state relay and wire...
  16. AnalogKid

    LED Light Panel

    The pot between the driver and each LED would have to be able to dissipate at least 50 W. In round numbers that'a a tennis ball in volume. Each. At these power levels, electronic control *always* is better. Also more complex, but also more reliable. Can you post a simple sketch of a...
  17. AnalogKid

    3.5MM Jack Socket

    It sounds like you want to modify the schematic you have. The schematic shows the microphone already connected. Are you asking about how to replace the mic with a jack so you can plug in an external microphone? If so, then it depends on the mocrophone. Some need two connections and some need...
  18. AnalogKid

    How does opening a car door work?

    just to repeat what duke37 said ...... The transmitter in the key fob sends out a coded signal. The receiver in the car decodes the signal, determnes if it is the right signal for that car, then sends out control signals to the car door mechanism to either lock or unlock the door. That is...
  19. AnalogKid

    Input Z of single supply opamp circuit

    Can you share a schematic of your design? It will help greatly with the advice. ak
  20. AnalogKid

    Question about Op Amps, FPGA, or Programmable Neural Networks

    Motorola had programmable analog devices in the 80's, and other companies followed. The two names that come to mind are Lattice (mentioned above) and Microchip. ak
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