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  1. C

    Extending battery life of 3.7 volt GPS

    You could go for the aa option and use a boost converter to ensure a constant voltage to the device
  2. C

    80V

    One thing, that 50ohm on pin3 is a little low, ideally a fet should be used or it will consume 40ma across the resistor 100ohm is better, anything higer simply does not saturate the transistor, hence the fet or even a darlington and a 1k on base..
  3. C

    80V

    A simple 555 booster circuit i made, probably not the most efficient circuit, reducing the timing cap to a lower/higher value will increase/decrease the voltage output
  4. C

    80V

    80v 5ma! I built a circuit earlier managing to pull 30ish ma from 80v (stepped up) Glad i re read this, 5ma seems reasonable, give me a few minutes and i'll modify it
  5. C

    hacking an LC meter

    I had one of them, i tested a Ge Diode, it took out one of the atmega pins! Figured i'd lift it out and swap for another chip, then tracking down the code to work with the pcb became the problem... Maybe i'll buy another and avoid ge diodes lol
  6. C

    hacking an LC meter

    I bought it to measure inductor values, and quickly realized it's not up for the job for most inductors Before i open it up, i'm hoping i can modify it for low inductor values, should i quit now? lol
  7. C

    Simple Conversion from Battery to Plug-In

    To simplify it... buy a 5v adapter (or a spare usb 120 to 5vdc) Then using say an lm317, you could stick out a potentiometer and vary the fan speed from a knob on the side, i suppose a diode could be added to the battery so that when the mains is plugged in, the battery will not drain or...
  8. C

    Identify diodes

    Measure the foward voltage drop, the bottom one looks like a zener (if you have an adjustable power supply, a 1k resistor and the diode in reverse, gradually increase the voltage until it begins to conduct while measuring voltage) Top diode? New to me, maybe it is a ge diode, measure the vdrop
  9. C

    80V

    Yeah, i don't see why not, winding a transformer or maybe using an inductor and a switcher
  10. C

    Destroying USB devices

    The ferrite filter acts as a choke, it will supress voltage spikes, but it seems to do the job for you to supress voltage spikes.. You could wire a TVS diode in parallel / across your usb, a 6v tvs diode should stop your problem dead
  11. C

    Controlling power levels of house electronics

    Maybe there needs to be an IR led mounted at the bowl at the toilet and a sensor up top... While the IR can't be detected, the water continues to flush (yeah yeah, what if the LED / Sensor fails... what if a jet engine fails...) It would solve the over flush and under flush problem lol
  12. C

    Energy saver

    Is it a scam energy saver? (PF correction) Or, is it a triac/dimmer style circuit?
  13. C

    Trap Door Project: DC BATTERY BACKUP for 12VDC Linear Actuator

    Trickle charge is there to keep the battery toppex up to 13.8/14.2 volts, the charger will dump a lot of current until it's nearly charged then switches to a 100ma or so to keep it topped up... Perfectly safe ..
  14. C

    DPDT Latching switches

    Have you tried ebay?
  15. C

    Interesting device development (projector, camera, wireless charging, fingerprint sensor all-in-one)

    This is kinda like asking a mechanic to build a car rather than repair a car... Each function is it's own electronic question, controlling the leds, the circuit for inductive charging.... you're asking for the car, not an alternator for a specific problem
  16. C

    555 timer circuit help?

    If you use android, download electrodroid, very handy! It's very comprehensive, it's saved my butt a few times :)
  17. C

    thyristor vs triac

    I'm posting this mainly for others, but after a few searches and ebay seller listings many people seem confused... While looking for resources to read, most people seem to interchange or use both "triac" and "thyristor" like they are both the same component! And to add to confusion "SCR" well...
  18. C

    Walmart power adapter voltage increase if in-between two settings?

    It almost sounds like an lm317 and several resistor dividers like the attached image Or it could be a transformer with multiple taps secondary side, but i'm not sure it would jump like that between positions
  19. C

    Controlling power levels of house electronics

    How come you can't/don't want a kill switch / fully off state?
  20. C

    555 timer circuit help?

    The heart of it so to speak, is the timing capacitor/potentiometer.. What do you have in mind for it? (The 555 is the swiss army knife of the electronic world)
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