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  1. C

    Battery Voltage Dilemma!

    Simply connect them in parallel and see what happens. Nothing.
  2. C

    How to design iron core transfomer ?

    You start with a core. What is your core?
  3. C

    Need help to make telephone tap coupler schematic

    20mA across 8R is 160mV
  4. C

    Need help to make telephone tap coupler schematic

    Put the mic socket across the speaker
  5. C

    calculate number of turns and length for inductor

    You won't get 26mH out of 30 turns. You have to have some idea of what you are doing before you can launch into designing your own inductors. It will take about 10 years of circuit designing to get to the stage of starting to design your own inductors.
  6. C

    Capacitor getting hot

    "specs of the dimmer and it's rated for up to 35v and 5 amps." provide a link
  7. C

    Need help to make telephone tap coupler schematic

    Just cut one wire and put a small speaker in the cut.
  8. C

    Linking circuits help

    Th LDR can be connected directly to the 555.
  9. C

    How does a 110v portable generator with brushes generate electricity?

    Generally an AC generator is brushless.
  10. C

    CMOS 4001 Repeating Timer

    Try just one 100k without any diodes
  11. C

    adjustable circuit breaker

    Just use fuse wire. Circuit breakers cannot be adjusted. They are SET.
  12. C

    Another "which diode to use" Question

    "What you need to decide is whether 1amp is sufficient or whether you need to go to 3 amp. " How can 3 amps flow through a 1k resistor???????
  13. C

    T3J81 (Zener Diode ?)

    1. All diodes are zener diodes. Some have a higher breakdown voltage. 2. All zeners need a breakdown-resistor in series. 3. Test the diode with a 300v zener tester as shown on talking electronics website and overcome the worry it is a zener.
  14. C

    Assignment problems

    The best starting point is to buy the detector from China for $120.00. It is already produced, perfected and ready to install.
  15. C

    Need help identifying this resistor's wattage.

    The resistor shown above is 3.3 ohms You can use 1, 2, or 3 watt as the resistor doesn't look like it is getting hot
  16. C

    T3J81 (Zener Diode ?)

    They are 2 amp diodes, maybe up to 1,000v They are not faulty.
  17. C

    Quick PCB design questions

    It is best to get a $5.00 prototype made and sent to the person who is going to produce the final product. I have had some dreadful mistakes by Chinese who hold your drawings up-side-down and produce a backward result. They never compensate you.
  18. C

    RGB Led cube and more..

    Start with a 3D LED Light Squared DIY Kit 8x8x8 3mm LED Cube White LED Blue/Green/Red/Yellow for $16.00, delivered to your front door. The LEDs do not change colour but they produce all sorts of different patterns and effects. You can select: blue, green red or yellow LEDs when you buy the kit...
  19. C

    Trouble understanding shunt resistance for short-circuit current measurement

    Why do you want to measure the short-circuit current? You don't buy solar cells for their short-circuit current capability.
  20. C

    Trouble understanding shunt resistance for short-circuit current measurement

    You really need more than one cell to do what you are trying to do.
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