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  1. audioguru2

    Dual LM3886 Bridged Amp.

    Stuee, The 8 ohm car speakers are made for people who want to drive them from car-factory radios, or to parallel them and drive them from a real amp. I replaced the 20 ohm factory speakers (with magnets as small as a thumbnail) with 4 ohm 6X9s, and now my factory radio sounds very loud and...
  2. audioguru2

    s-video + audio to VHF/UHF (antenna cable)

    Fudy, You want to make a TV transmitter? It is very complicated (vestigual sideband, video and audio carriers with colour and stereo sidebands, sync, etc.) and is probably illegal without having a broadcaster's license. The Guru has spoken.
  3. audioguru2

    High Voltage Stun Gun !

    Fahad, Don't wind the transformer windings with your hand, or the wire will get twisted. Just spin the ferrite like a winch, and let the roll of wire also spin.
  4. audioguru2

    Mist MAker Via Oscilloscope???

    InFLak, Do you want to fix the broken mister by making your own circuit to replace its "cement thing"? The piezo certainly doesn't work at 1.7MHz, so the cement probably has a digital frequency divider inside. The little piezo will have a very low efficiency at only 340Hz, and its buzz would be...
  5. audioguru2

    Dual LM3886 Bridged Amp.

    Stuee, Two LM3886 amp chips can be bridged to drive an 8 ohm load. It will current and SOA limit if it was bridge-driving a 4 ohm load. Most car speakers are 4 ohms, so this application is not suitable for a car amp. Besides, a car amp is lucky to provide at most 20W of real RMS, low distortion...
  6. audioguru2

    "Notify of Replies"

    Yes, Ante. This is my 1st and only computer, and it is a 486DX/100. I upgraded to the last 486 chip that Intel made, with Pentium features such as bigger L1 cache memory. The CPU chip and its 5V to 3.3V regulator are fitted to a daughter board that is the same size as an older 486 DIL chip. My...
  7. audioguru2

    "Notify of Replies"

    MP, I have heard that Win98, 2nd edition, would eat my 2G hard-drive (with many files) for lunch and again for dinner.
  8. audioguru2

    Question on the Plants Watering Watcher circuit

    To All, Didn't anyone notice? The oscillator's frequency CANNOT increase when the soil's resistance also increases, as my idea requires: So I'll try the original circuit with an added delay capacitor and a new 74HC132 to replace the old 4093. I'll report my findings.
  9. audioguru2

    electrostatic & leyden jars

    Greenpogo, Doesn't a leyden jar and any other capacitor charge with Direct Current? Your neon transformer produces Alternating Current. To convert the AC to DC use the high-voltage rectifier from a colour TV. Your film container may not have enough insulation to hold a charge. The film...
  10. audioguru2

    Capacitor charging

    Ante, A triangle wave can be extremely linear if you use an integrator that is made from an opamp that has a voltage-gain of 100,000 or more, and use a low frequency. Of course the linearity drops at higher frequencies. Gross linearity error can be seen as a departure from a straight line on a...
  11. audioguru2

    Dual LM3886 Bridged Amp.

    ZomBiE, The LM3886 can be bridged to give typically 136W of low-distortion wide-band power into 8 ohms. You should build it, layout a PCB and post it in our projects section. Do you have access to a low-distortion generator and distortion analyser? It will be important for you to analyse the...
  12. audioguru2

    0-30 Vdc Stabilized Power Supply

    Hi Zia, welcome to our forum. About this power supply: 1) We have already determined that the transformer's 3A rating is too low because the output of the power supply is 90VA (30V X 3A). If you use a much higher current rated transformer, then its voltage won't sag as much during rectifier...
  13. audioguru2

    "Notify of Replies"

    Thanks, MP. Microsoft won't let my old browser into there either, "Connection with server cannot be established". This minor problem is the only one that I have had. My wife says that an occasional contest URL won't let her in. I have heard that newer browsers are resource-hogs and eat...
  14. audioguru2

    Question on the Plants Watering Watcher circuit

    Ante, Ha, Ha, and S-O-S to you too.
  15. audioguru2

    Why use RMS

    Kevin, Thank-you for correcting me. I am sorry that I got the sequence wrong. A good description of RMS, simple meters and true-RMS meters is here: http://www.ee.unb.ca/tervo/ee2791/vrms.htm
  16. audioguru2

    "Notify of Replies"

    Too many choices. MP, Which alphabet Font setting is your OE using on your Win98?
  17. audioguru2

    "Notify of Replies"

    MP, Thanks for the suggestion but Microsoft won't let me in because their "update" URL responds only to browsers using IE5.5 and up, which I don't have. They want me to BUY an update. I think that I am on the right track: I just changed the alphabet in my OE font settings to "universal" from...
  18. audioguru2

    Electronic Stethoscope

    To All, How come, OOOps, why is it that Cdak's professional and even his own graphs show a heartbeat with a low frequency vibration? If a heart beated with those vibrations then I think that its owner wouldn't be alive for very long. Is it the skin under the stethoscope head that is vibrating...
  19. audioguru2

    Question on the Plants Watering Watcher circuit

    Thanks, Guys. Another improvement: A bi-colour LED that flashes Green when the soil is not too dry, and flashes quickly Red when the soil is very dry.
  20. audioguru2

    Electronic Stethoscope

    Cdak, The electret microphone preamp circuits that I build don't pick-up hum, so why does yours? No shielded cable?
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