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  1. audioguru2

    Stun Gun from Camera Flash

    Hi Mad Dog, Welcome to our forum. ;D You have the weak electronic circuit from a disposable camera's flash, not a powerful circuit for a stun gun. Now its weak oscillator slowly charges its high voltage capacitor, it makes a single spark then charges the capacitor slowly again. I have never...
  2. audioguru2

    Unbalanced to blanced

    The OPA134 single opamp, OPA2134 dual opamps and OPA4134 quad opamps are pretty good. Very low noise, wide bandwidth and distortion rated at only 0,00008%. They have FET inputs so they don't have bias current.
  3. audioguru2

    a high pass filter question

    A low power audio power amplifier IC is the same number of parts as a high power audio power amplifier IC. Then the high power IC needs a big heatsink. If you are making your own power amplifiers then just use darlington transistors on the output of the high power audio amplifier. If you are...
  4. audioguru2

    filtering

    You can make a lowpass filter and a highpass filter with LC circuits. Their load must not change resistance or they become series-resonant and short the source. Radio circuits and speaker crossover networks have LC lowpass and highpass filters.
  5. audioguru2

    Does any one have an idea?

    I didn't count how many projects are here. Discovery claims to have more than 25,000 projects. Make them all. http://www.discovercircuits.com/index.htm
  6. audioguru2

    Unbalanced to blanced

    I told you already. An expensive transformer will have a good enough audio bandwidth and will have mu-metal magnetic shielding to avoid picking up mains hum. A good opamp doesn't have these probems, is smaller and is less expensive. The TL071 is not the best but it has good value for an audio...
  7. audioguru2

    Unbalanced to blanced

    Two opamps can convert an unbalanced audio signal to balanced. One opamp is non-inverting and the other opamp is inverting. They both have the unbalanced signal as their inputs and both have the same gain.
  8. audioguru2

    Unbalanced to blanced

    Good microphones are balanced already. An audio transformer cuts high and low frequencies unless it is expensive and picks up magnetic mains hum unless it has expensive mu-metal shielding. An old opamp will add noise and cut high frequencies but a newer opamp will convert unbalanced audio to...
  9. audioguru2

    Unbalanced to blanced

    It depends on the frequency. Audio? Low RF? High RF? UHF? All the TV RF frequencies?
  10. audioguru2

    a high pass filter question

    A small radio is not very loud because it has a small inefficient speaker, a small amplifier that doesn't need a heatsink and a small battery that can't provide much current for a long time. A loud radio has a big efficient speaker, an amplifier with a big heatsink and a big battery that can...
  11. audioguru2

    filtering

    A Surface Acoustic Wave is sent across a tiny crystal that has many breaks in it and the result is a response that has an accurate center frequency, low insertion loss, flat bandpass and very steep sides. Google has too much information about them.
  12. audioguru2

    filtering

    The Q of a tuned LC circuit determines its bandwidth. A high Q has a very narrow bandwidth and very steep sides. Cascaded filters increases the overall Q. Ceramic filters are used for wide bandwidth and steep sides in the IF amplifier of FM radios. SAW filters are used for TVs.
  13. audioguru2

    circuits

    Radio and TV circuits must be compact to reduce stray capacitance and inductance in the wiring. Your soldering iron is too powerful for electronics. Connect a rectifier in series with it to cut its power in half. Use a switch to short the rectifier for full power.
  14. audioguru2

    Switch needed

    A series capacitor will provide a momentary pulse no matter how long the pushbutton is held down. If the pushbutton connects the capacitor to ground then a resistor is needed to connect it to the positive supply, or visa-versa. The other side of the capacitor also needs a pullup or a pulldown...
  15. audioguru2

    opamps

    1) The microphones have a very low level so each one needs a preamplifier. The preamplifiers have very low output impedances so the value of the 10M resistors is way too high. Replace the 10M resistors with 10k. 2) Very few good opamps work with a supply voltage of only + and -2.5V. Use + and...
  16. audioguru2

    opamps

    Hi Mettula, They are not opamps. They are "matrix adding and subtracting circuits". Opamps can be used to make them but the details are not shown.
  17. audioguru2

    push pull

    There are a few different push-pull circuits. We don't know which one you have until you attach the schematic.
  18. audioguru2

    opamps

    Your schematic is wrong. Opamps don't have two "+" inputs. Attach the entire schematic and we will show you which one is "+" and which one is "-".
  19. audioguru2

    Question on the Plants Watering Watcher circuit

    Your capacitors are fine.
  20. audioguru2

    Question on the Plants Watering Watcher circuit

    Hi Satty, I have made many of these projects and they don't "latch". Did you substitute any parts? Maybe it does something funny with a 5V supply. I can have a 100k pot beween the probes and the LED is off when the pot is zero ohms to 47 ohms then it gradually gets brighter until the pot is...
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