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  1. kellys_eye

    Component id needed

    One side of it is definitely connected to chassis ground (via the screw hole in the pcb) so it's certainly a transient suppressor. Such suppression can take the form of a capacitor and/or resistor to bleed voltages to ground (static).
  2. kellys_eye

    resistor only ring modulator

    I didn't infer your banning - what are you? a camp guard? That said, if you continue to spout such nonsense as this: and ignore such comments as this: then you are neither helping yourself or others. "shoot up" and "block with voltage" are phraseology we got from 'the troll' and it's not...
  3. kellys_eye

    Power supply problem

    Getting a perfectly accurate schematic might be an issue (not impossible) but there are many 'near enough' schematics out there that will give enough insight for anyone familiar with SMPS repairs.
  4. kellys_eye

    resistor only ring modulator

    This is reminiscent of a forum user that trolled us for weeks before someone had the gumption to bin them. Same Falstad crap, same non-understanding, same trolling.
  5. kellys_eye

    Sallen Key Low Pass Filter, bandpass filter

    Which will never happen..... your device is a peak meter (emphasis on the peak) and will only require a properly designed power supply that can cope with said peaks. As for using 7809 regulators - you only need them for the audio processing side. You could use 'any' supply voltage to drive...
  6. kellys_eye

    In Wind Turbine, DC Motor is rotating from battery energy, discharging the battery after charging.

    You need a blocking diode to prevent the batteries 'back feeding' to the wind turbine. Google 'blocking diode',
  7. kellys_eye

    Component id needed

    The inclusion of a 'flash-over safety slot' in the pcb would indicate that the device is some form of transient protection.
  8. kellys_eye

    Exercise arm bike power board repair

    Quite possible. These effects are known as 'dry joints' and commonly caused by the component moving during the soldering process and before the solder has properly set. Other issues stem from the poor soldering of off-board connectors (sometimes added after all the main components have been...
  9. kellys_eye

    Kitchenaid Artisan Mini 3.5 Quart Tilt-Head Stand Mixer

    The capacitor will have its value and rated voltage printed on it somewhere. These are commonly called 'motor start capacitors' and very readily available in many voltages, values and physical sizes, one of which will work even if it doesn't 'look like' the original item. Always assuming it's...
  10. kellys_eye

    relay module connection

    The relay contact(s) will only switch the POSITIVE wire to your LEDs. All the negatives will tie together and go straight to the power supply negative (ground) output. I your case I'd wire the positive from the PSU to all the 'COM' relay terminals and use the NO contact to deliver that voltage...
  11. kellys_eye

    Thermoelectrics and Thermophotovoltaic modules

    Unless the claims were a crock, that is. Commonly available TEG/TPV modules have no where near that capability. Finding one of that rating and such a small size would be unlikely to say the least. Best stick with existing, proven, actually-in-manufacture items than speculative claims otherwise.
  12. kellys_eye

    learn how to check capacitors

    I get the impression this is a homework question. In the 'real world' a capacitance check would involve specific (dedicated) test equipment that will deliver both the component value (many testers capable of reading from a few pF to 100's microfarads) plus the component ESR (equivalent series...
  13. kellys_eye

    What did I do wrong in my first project?

    What device are you using for D5 (flyback diode)? You can't use an 'ordinary' diode, it must be of the schottky type (fast recovery). Try changing it. Can you wire that device up off-board (flying leads or breadboard will do). You might have gotten unlucky with two dud devices and/or been...
  14. kellys_eye

    Exercise arm bike power board repair

    Item (1) is a fast recovery diode (worthwhile downloading the datasheets of those devices just to see what's what). The diode readings you see on your meter are the forward voltage drops of the two diodes within that package and '437' is actually 0.437V and indicates GOOD diodes - nothing wrong...
  15. kellys_eye

    Component id needed

    The voltage rating (125VAC) indicates the device may be a VDR (voltage dependent resistor/ surge protector) whose value is nominally 4Mohms dropping to 2.5 ohms as it (rapidly) heats up. Not seen one in this style before so maybe someone on here else is more familiar with it? A $20 component...
  16. kellys_eye

    15BSB zener diode

    Most zeners (that I know of) have a tolerance of 5% so 'float your boat'! A 15V one will do.
  17. kellys_eye

    Sallen Key Low Pass Filter, bandpass filter

    Oooo, we could have a quiz - everyone lists a dozen 'random devices' and we guess what could be done with them. Not.
  18. kellys_eye

    15BSB zener diode

    500mW, 14.2V(ish) zener
  19. kellys_eye

    15BSB zener diode

    https://www.alldatasheet.com/view.jsp?Searchword=15BSB
  20. kellys_eye

    How to find components with certain specifications

    I would have thought using a reservoir of air controlled through a valve/pressure regulator would be the way to go. This eliminates the requirement for accurate control of the motor and puts the emphasis on the valve/regulator which is far easier to control and has many more versions available.
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