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Old 25th December 2007, 05:29 PM   (permalink)
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Quote:
Originally Posted by aljamri
yes all that information as per its datasheet but unfortunately i cannot attach it here.

but as i said guise, it is working fine, just the little hiss which prevent it to be perfect, what can be adjusted even as trial step
Like I said (twice), it's a GUITAR effect pedal, you need to run it at a MUCH higher signal level than a microphone provides - add a preamp to the front, and turn down the gain on what it's feeding.
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Old 25th December 2007, 05:49 PM   (permalink)
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Quote:
Originally Posted by Nigel Goodwin

Like I said (twice), it's a GUITAR effect pedal, you need to run it at a MUCH higher signal level than a microphone provides - add a preamp to the front, and turn down the gain on what it's feeding.

I got it this time, i'll try and let you know.

Thanks . happy Christmas and new year for all.
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Old 26th December 2007, 07:40 PM   (permalink)
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Quote:
Originally Posted by Nigel Goodwin
Like I said (twice), it's a GUITAR effect pedal, you need to run it at a MUCH higher signal level than a microphone provides - add a preamp to the front, and turn down the gain on what it's feeding.
Can i use this circuit:

http://www.electro-tech-online.com/g...questions.html

in addition to the suggested pre-amp it is good to get more than one MIC inputs.

thanks
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Old 26th December 2007, 07:50 PM   (permalink)
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That's specifically for an electret mike, I thought you had a dynamic one?. What impedance is it?, and is it balanced or not?.
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Old 26th December 2007, 07:54 PM   (permalink)
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Quote:
Originally Posted by aljamri
Can i use this circuit:

http://www.electro-tech-online.com/g...questions.html

in addition to the suggested pre-amp it is good to get more than one MIC inputs.
That circuit uses the 10k input resistor to power an electret mic. The circuit will work with a dynamic mic if the 10k resistor is removed.
Use a TL071 single opamp instead of the TL072 dual opamp. Its pins are different, see its datasheet.

Use a mixer circuit and more preamps if you want more than a single microphone.
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Old 26th December 2007, 08:23 PM   (permalink)
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Quote:
Originally Posted by Nigel Goodwin
That's specifically for an electret mike, I thought you had a dynamic one?.
Yes mine is dynamic.


Quote:
Originally Posted by Nigel Goodwin
What impedance is it?,
Nothing is written on it


Quote:
Originally Posted by Nigel Goodwin
and is it balanced or not?.
How to check ?

Thanks
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Old 26th December 2007, 08:27 PM   (permalink)
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What make is the mike?, and what type of connector does it have?.
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Old 26th December 2007, 08:32 PM   (permalink)
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I betcha it is a balanced mic with an XLR connector.

Plug it into the mains and if I am right then it will light up (and make a lot of smoke). It might make a brief buzz just before it dies.
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Old 26th December 2007, 08:41 PM   (permalink)
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Quote:
Originally Posted by audioguru
That circuit uses the 10k input resistor to power an electret mic. The circuit will work with a dynamic mic if the 10k resistor is removed.
Thanks for suggestion,

Quote:
Originally Posted by audioguru
Use a TL071 single opamp instead of the TL072 dual opamp. Its pins are different, see its datasheet.
I thought of combining this circuit outputs ( in parallel ) and connecting them into input of reverb circuit !? is that wrong ?

Quote:
Originally Posted by audioguru
Use a mixer circuit and more preamps if you want more than a single microphone.
can i use this:

http://www.electro-tech-online.com/e...ighlight=mixer

Thanks
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Old 26th December 2007, 08:56 PM   (permalink)
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Quote:
Originally Posted by Nigel Goodwin
What make is the mike?, and what type of connector does it have?.
attaced are two pictures of the used MIC. it is moving coil TOA DM-1200. 600hm: .
Attached Images
File Type: jpg Image043.JPG (162.5 KB, 1 views)
File Type: jpg Image044.JPG (300.1 KB, 1 views)
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Old 26th December 2007, 08:59 PM   (permalink)
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Quote:
Originally Posted by aljamri
I thought of combining this preamp circuit output ( in parallel) and connecting them into input of reverb circuit !? is that wrong?
One preamp's output can connect to the input of the reverb circuit. If you have more than one microphone then each one needs to have its own preamp.
You cannot short the preamp outputs together, they must feed the inputs of a mixer circuit that feeds the reverb circuit.

It is very simple and attenuates the signals. You need a mixer made with an inverting opamp.
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Old 26th December 2007, 09:05 PM   (permalink)
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Quote:
Originally Posted by aljamri
attached are two pictures of the used MIC. It is moving coil TOA DM-1200. 600hm: .
I was right!
Told ya so. Told ya so. Told ya so. Told ya so. Told ya so. Told ya so. Told ya so. Told ya so.

Make a video of the smoke.
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Old 26th December 2007, 09:14 PM   (permalink)
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I am very new to AUDIO stuff, do you mean it is not good, i bought it for more than $50 ? if so what type do you suggest for me ? not for the best, but what will give better than this ( only for voice and not for music ).
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Old 26th December 2007, 09:48 PM   (permalink)
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Your TOA microphone is fine. It is balanced with an XLR connector so buy a matching XLR jack and wire it as unbalanced if your cable is a couple of meters or less short length.

Your TOA amplifier has a balanced mic input on its preamp. It is too bad that it doesn't have a switch for you to use its preamp in your arrangement.
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Old 27th December 2007, 05:28 AM   (permalink)
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Quote:
Originally Posted by audioguru

Your TOA microphone is fine. It is balanced with an XLR connector so buy a matching XLR jack and wire it as unbalanced if your cable is a couple of meters or less short length.

Yes i bought one and it works fine without my circuit, when i put my circuit in between, hiss appears. I removed the battery from my circuit and the hiss still there.

My cable is more than 5 meters, is that bad ?
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