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  1. audioguru2

    Need some electronic add-on ideas for my new project (Stirling engine)

    Hi Ed, That's a good idea. ;D You could have them each drive a solar-cell fan motor and their shafts could be connected to a belt, to show motion and point to the winner in the "tug-of-war" contest. If one is much stronger than the other, the weakest will be pulled in reverse. :o
  2. audioguru2

    Need some electronic add-on ideas for my new project (Stirling engine)

    Hi Dazza, I'm sorry to be so pestimistic but 1 candle power isn't much power. I don't think it has enough power to drive an ordinary motor for its use as a DC generator. Maybe a very low-power electric motor for a school solar-cell spinning fan project might provide the low amount of drag that...
  3. audioguru2

    0-30 Vdc Stabilized Power Supply

    Hi Costa, It is good that you corrected the mis-wiring of Q2. ;D Your current regulator works, but gives only about half the current that it should. It uses R7 as a current-sensor which is in series with the load at the project's 0V output terminal, and R17 to measure its voltage drop at the...
  4. audioguru2

    Need some electronic add-on ideas for my new project (Stirling engine)

    Hi Dazza, A single candle power? Then you'll be lucky if you get 1/2 a candle power out of a generator which isn't much. Maybe you could make a bon-fire or use a blow-torch to power the engine to make enough electrical power to do anything. ;D
  5. audioguru2

    Sine wave inverter

    Hi Arunava, Sorry, you didn't say at first that you were using twoIC's. ::) Your circuit should work since your block diagram is very similar to the circuit that I posted. Please post a detailed schematic of your circuit so that we can determine if the opamp and buffer are powered and biased...
  6. audioguru2

    Sine wave inverter

    Hi Arunava, You can't compare the 8038's triangle wave, you must compare a triangle wave of the PWM clock oscillator with the low frequency sine-wave. So you can use any simple circuit to make a sine-wave like a Wien Bridge or Phase-shift oscillator. You need a circuit that makes a variable PWM...
  7. audioguru2

    High Quality electronic sites

    I like free stuff. ;D ;D
  8. audioguru2

    0-30 Vdc Stabilized Power Supply

    Hi Costa, The current regulator doesn't work at max current setting and a shorted output. The voltage regulator doesn't work with a load because you measured U2 pin 6's voltage dropping. It sounds like Q2 is shorted base to emitter or its collector is disconnected or faulty. Make sure you don't...
  9. audioguru2

    0-30 Vdc Stabilized Power Supply

    Hi Costa, R22 doesn't have anything to do with regulation. When its output voltage drops under load, does the current regulating warning LED light? Does it light when you short the supply's output? Turn the voltage and current pots to max. Measure the voltage of U2 pin 6. With a load it should...
  10. audioguru2

    High Quality electronic sites

    Hi Asahin, http://schforfree.seedhost.com/archive/ have many great schematics but isn't exactly free. I looked around for a while then a bar-graph popped-up saying I had 7Mb of my 10Mb "guest" limit remaining and the limit resets next week! They want a $5 donation to be an unlimited subscriber. ;D
  11. audioguru2

    Project help needed ..very very simple for the lot of you probably.

    Hi Alun, Zoom in on the pic. If there is someone standing in a bikini or less on the other side you can't even see her without using a telescope. ;D If it's 300m from the left bank to the finish line, how long is the string of lights? 1km?
  12. audioguru2

    Project help needed ..very very simple for the lot of you probably.

    I've never seen those tiny fl bulbs that have an inverter inside. Look at their high cost. I figure that a few thousand would draw about a thousand amps. ::)
  13. audioguru2

    Project help needed ..very very simple for the lot of you probably.

    Hi Ed, I've seen 4 inch flourescent tubes on night-lights and 3-way flashlight toys  at the dollar store. Their small amount of light output illuminates things only a little when up-close. they are more than twice too long to fit in a 44mm golf ball. ;D
  14. audioguru2

    Project help needed ..very very simple for the lot of you probably.

    I have never heard of a small flourescent bulb.
  15. audioguru2

    Project help needed ..very very simple for the lot of you probably.

    Hi Obscure, You won't be able to fit a car battery into a golf ball. Besides, if you do, it would sink. ::) Seriously, you are talking about power from nuclear batteries that you need to steal from a roving spacecraft or UFO. :o You must be tethering the bubbles, so send land power down the...
  16. audioguru2

    TRANSMISSION LINES

    When a pilot sees one of those things a few meters in front of his plane, you're darn right he'll be scared. They are too small to be a warning. I always thought that they were heavy dampers so the lines don't have mechanical oscillation in the wind. Hang a weight slightly off-center on a...
  17. audioguru2

    Use a speaker as a microphone while useing it as a speaker

    Hi Alun, The MC34018 uses a very sophistocated voice switch, I built one and it worked very well, but your idea won't have any switching between transmitting and receiving. In your case surely the mic will hear the speaker and the other end will amplify it, return it back to the first end and...
  18. audioguru2

    Electronic Eavesdropping Devices Detector

    I have corrected the schematic for the Electronic Eavesdropping Devices Detector project so that it is the same as the project's pcb and parts layout diagram, and is also the same as National Semiconductor's schematic:
  19. audioguru2

    EYE SIGHT SENSOR

    They are too young and probably won't understand. He, he. ;D ;D
  20. audioguru2

    An Ultrasonic Cleaner--Schematic

    Can you remember years ago before you knew anything about electronics, when every schematic looked like snakes and ladders like that ASCII one looks like now? It gives me the creeps! :( ;D ;D
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