converting pedal for dual supply and line level signal

[seedseed]

Hi everyone,

I would like to use some of the pedal designs with dual polarity power iam assuming with most op amp circuits that where the bias goes which is usually split via a voltage divider resistors becomes 0 volts and of course  pin 4 of a dual op amp for instance becomes Negative and VCC pin 8 becomes Positive. But the question i have is the bias voltage that is fed into either the inverting or non inverting inputs make an effect on the pedal. Or in other words does the ac signal over the dc voltage essentially give the unit more grunt. the other thing i was going to do is put an input pot on the input with of course one leg goint to earth to attenuate the signal so i can use it with line level. Some of these pedals will work great with line level signals i think? will soon find out. I was going try and use John Hollis flatline compressor as a way of stopping the annoying adverts that come through on tv so i get a constant signal out on my speakers to keep more of a better dynamic range coming out of my speakers. I was thinking it would run better with a larger supply voltage the other pedal that i believe would work well in this situation is the baja la2a like compressor but as far as i can see the flatline works  more like a automatic volume control where as the baja unit acts more like a peak limiter. Any comments or suggestions i would love to hear from you guys

[CynicalMan]

Hi everyone,

I would like to use some of the pedal designs with dual polarity power iam assuming with most op amp circuits that where the bias goes which is usually split via a voltage divider resistors becomes 0 volts and of course  pin 4 of a dual op amp for instance becomes Negative and VCC pin 8 becomes Positive. But the question i have is the bias voltage that is fed into either the inverting or non inverting inputs make an effect on the pedal. Or in other words does the ac signal over the dc voltage essentially give the unit more grunt.

I wouldn't say that it gives the sound more grunt, I'd say that it makes the circuit work! Op amps need a bipolar supply, and biasing them like that simulates a bipolar supply. Other wise the DC is inaudible. It has no effect on the tone of a pedal.

the other thing i was going to do is put an input pot on the input with of course one leg goint to earth to attenuate the signal so i can use it with line level. Some of these pedals will work great with line level signals i think? will soon find out. I was going try and use John Hollis flatline compressor as a way of stopping the annoying adverts that come through on tv so i get a constant signal out on my speakers to keep more of a better dynamic range coming out of my speakers. I was thinking it would run better with a larger supply voltage the other pedal that i believe would work well in this situation is the baja la2a like compressor but as far as i can see the flatline works  more like a automatic volume control where as the baja unit acts more like a peak limiter. Any comments or suggestions i would love to hear from you guys

This would work, although I think a compressor wouldn't help that much. Ads generally aren't louder than the show, they are just compressed to make them seem louder. A compressor with a slow attack and release might help, but it could sound weird.

[PRR]

> compressor as a way of stopping the annoying adverts that come through on tv

Won't work. Those commercials are already professionally COMPRESSED all to heck and beyond.

You "could" boost the program's soft passages (and film hiss) to be as LOUD and ANNOYING as the commercials. And then turn down a bit. That would ruin the effect of good soundtracks.

We won't watch TV without a MUTE. Even before TVs had remotes, I would run a wire across the room so we could turn-down from the couch.

[petemoore]

  Find or build TV-B-Gone...aiu it works.
  Another method that can work is find a 'dead' channel and use quick-view.
  "The stick" control worked fine on the XL knob-volume, the loop I put on the end of it grabbed the volume control so my end of the stick could twist the drive assembly [ie broomstick that connects to volume control knob.
 But I put a lazer controlled motor/belt assembly on it instead, it's easier/quicker and doesn't require the X-long rake handle.
   Hope that helps, but the ads are getting harder to distinguish from the shows too so the viewer still has to do some filtering to get only the info desired and none of what somthing or someone else wants you to be impressed with.