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  1. AnalogKid

    Dumbwaiter Logic Circuit

    You said the winch motor is 110 V, but you didn't say AC or DC. Is the winch motor reversible? An Arduino output can directly drive a standard solid state relay. With all of the logic inside the Arduino, there are only two relays required, up and down. ak
  2. AnalogKid

    Oscillating reed switch

    Maybe the solution lies here. What did you try? Why did they "stop"? ak
  3. AnalogKid

    opto isolated h bridge PCB design

    Have you ever laid out a pc board before? ak
  4. AnalogKid

    opto isolated h bridge PCB design

    Help with what? Do you have any specific questions? ak
  5. AnalogKid

    Wireless power transfer

    N.o. o.n e. does wireless charging that way. ak
  6. AnalogKid

    Wireless power transfer

    I don't know what you mean by tesla style. Wireless charging is basically an air-core transformer. Wireless phone charging now is so common that there is an international standard so different manufacturers devices work together. https://en.wikipedia.org/wiki/Inductive_charging...
  7. AnalogKid

    12vdc relay

    Do you need ground isolation between whatever is driving the relay coil and the arduino board connected to the relay contacts? If not, then the relay can be replaced with a 1-transistor circuit, or maybe just 2 resistors or 1 resistor and 1 zener diode. Driving the arduino input directly will...
  8. AnalogKid

    Transistors

    Really?
  9. AnalogKid

    Transistors

    Grand old deck. Viet Nam vets brought Akai back with them; they blew away anything in the US consumer market at that time. Cross field bias, specs out the wazoo. Nothing wrong with your technique. Without a schematic there will be a lot of trial and error, but as long as you don't hurt the...
  10. AnalogKid

    Transistors

    For *signal* transistors (as opposed to power transistors): Material Used - SAME Polarity - SAME Order of C/B/E pins - not important, but pay attention! Collector-Base Voltage - ignore Collector-Emitter Voltage - same or larger Emitter-Base Voltage - ignore Collector Current - same or larger...
  11. AnalogKid

    Motherboard Power

    An ATX motherboard will be *significantly* less efficient / more power hungry than a laptop anything. While your motherboard might not need or use all of the standard ATX voltages, it might have an onboard monitor that requires all of them to be present. Separate from that, the most efficient...
  12. AnalogKid

    Reversing polarity

    To be clear, you want the system to run back and forth continuously? ak
  13. AnalogKid

    Reversing polarity

    A wiring diagram and a schematic are two different things. Please draw a schematic using standard relay symbols so we can see what you are trying to do. Pin numbers on a socket don't really tell much. ak
  14. AnalogKid

    Woo-Woo Free Energy From Pulsed DC Transformer

    Exploiting "Back EMF After switching" is called a flyback power supply. This was invented in the late 1800's, so you are about 118 years late. ak
  15. AnalogKid

    Multi power supplies housing

    Do you have an estimate for the peak current needed for *each* output voltage? Do not assume that a module that is labeled as needing +/- 12 V draws the same current from both supply voltages. For negligible current, a zener diode works well. ak
  16. AnalogKid

    What type of capacitor

    The small orange-ish capacitors are 0.1 uF (100 nF), 250 Vdc. However, they are mylar or some other metalized film construction, and do not leak. In the photos they look like they were glued down with RTV, not leaking. Large round electrolytics do leak, so if you have fluid evidence I would...
  17. AnalogKid

    Switch to bypass ribbon cable (turn off and on)

    This thread is almost 1 year old, but the device still might be in warranty. If the dealer won't agree, contact the factory directly. They always want to know about infant mortality issues, and might foot the bill for the repair. Also, yours might not be the only one and there is a free...
  18. AnalogKid

    Square wave to DC level

    A lowpass filter will turn the signal into 1.5 V DC. A peak detector will turn the signal into a constant 3 V DC. If the amplitude doesn't change (always 3 V peak-to-peak) and the frequency doesn't change (always 4 kHz) and the duty cycle doesn't change (always 50/50), then what are you...
  19. AnalogKid

    Looking for 10K130 to be replaced.

    Photo? The number 130 appears in the part number of many varistors and MOVs intended for 120 Vac use, so I agree with your guess. A photo of the top and bottom sides of the board would help us do a basic trace to see how it is connected. As for replacing a 10 with a 5 - I recommend not...
  20. AnalogKid

    Looking for help designing a timer

    You're missing something - the changes you listed add up to a significant modification of an existing product. But you have given us literally zero information to work with. Schematic of "the timer I have" Photos inside and outside That one is easy - you tell us how many digits you need...
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