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  1. C

    why the voltage regulator AMS-117 may burnt -out?

    AMS -1117 is not a regulator identifier
  2. C

    Driving a 12V COB LED ring with a portable battery (beginner's headache)

    If the LED strip has built-in resistors,simply put a string of 4 x 1N4004 diodes on the positive wire.
  3. C

    1/2 power

    You have the earth connected to the neutral and the neutral connected to the earth
  4. C

    555 timer question

    http://www.circuitbasics.com/555-timer-basics-monostable-mode/ This discussion contains a mistake - that I have corrected. The rest of the English is VERY poor.
  5. C

    1/2 power

    Maybe the lamps have leakage. Try just 2 pins
  6. C

    Photo resistor and electro-magnet

    That's a bad circuit. You just want a pulse to activate the electromagnet.
  7. C

    Low Power Consuming Reed Switch Timer Circuit

    Try this circuit:
  8. C

    Solar charging.

    A power supply set to constant current is COMPLETELY DIFFERENT to a solar panel.
  9. C

    Solar charging.

    "I think 600 watt-hours per day is very optimistic for a 100 watt solar panel. " You have no idea where he lives. Even if it is 400 watt-hours, it is far in excess of what he needs. "The OP wants the battery to stay charged for weeks at a time," Your understanding of English is different to...
  10. C

    wiring multiple candles

    What type of battery is in the tea light and how long does it last ?
  11. C

    Echolocation project

    Those sensors are about $2.00 on ebay. You need to detect the output and amplify it. I have used an 8-pin micro PIC12F629 to do that.
  12. C

    Solar Battery NiMh Charger w/ Solar Panel as Light Detector

    That circuit is all you need.
  13. C

    how to design an AM transmitter and AM receiver?

    An FM transmitter goes 10 times further with the same output and is much easier to design and has much less background noise.
  14. C

    Solar charging.

    A 12v panel will NEVER charge a 12v battery. The panel must output at least 18v (max 18v is sufficient) because a charged 12v battery will create a "floating charge" of up to 15v, and some are even higher, before producing a gas. You need a diode and some form of control to prevent over...
  15. C

    battery powered heater

    It solely depends on the length of the copper wire or strip or sheet.
  16. C

    Need a push/pull solenoid type of device to work off a very small battery

    What is wrong with the very clever circuit it contains. You will never get a more clever circuit. It has no switches or contacts and works by the magnet producing a voltage in the coil to turn on the transistor for EXACTLY the right number of milliseconds.
  17. C

    Time Lag Fuse Blowing

    I ONLY want the OP to answer my questions.
  18. C

    Time Lag Fuse Blowing

    How it blows is the MOST IMPORTANT point.
  19. C

    Time Lag Fuse Blowing

    If it is a slo-blo fuse, it will have a dob of solder connecting the two wires. You have to work out if the solder has melted or the wire has evaporated.
  20. C

    Counter Circuit Troubleshooting

    That's exactly what I have been saying for years.
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