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Old 19th December 2005, 03:53 PM   #1
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Default Need to boost signal for use with pro amp

I need an easy-build-design to boost a 300 millivolt signal up to about 1.5 volts to use for a pro amp. Any suggestions?
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Old 19th December 2005, 10:01 PM   #2
lineup is offline lineup  Sweden
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Default Re: Need to boost signal for use with pro amp

Quote:
Originally posted by G.L. Tirebiter
I need an easy-build-design to boost a 300 millivolt signal up to about 1.5 volts to use for a pro amp. Any suggestions?
I have a little 4 Transistor circuit I am trying to figure out.
I think it should fit perfect for amplify 0.3 to a 1.5 Volt output.

Supply something like 12 or 9 Volt.
Gain is = R2/R1 + 1
Output of Q3 at half supply voltage.

I need some help to find out how much current each transistor should have?
To get a good performance.
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Old 19th December 2005, 10:12 PM   #3
Zen Mod is offline Zen Mod  Serbia
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Default Re: Re: Need to boost signal for use with pro amp

Quote:
Originally posted by lineup


I have a little 4 Transistor circuit I am trying to figure out.
I think it should fit perfect for amplify 0.3 to a 1.5 Volt output.

Supply something like 12 or 9 Volt.
Gain is = R2/R1 + 1
Output of Q3 at half supply voltage.

I need some help to find out how much current each transistor should have?
To get a good performance.
every pro amp of this era have some sort of unbal-balancing gizmo on input,most offten made with OPs.

maybe is easier and cleaner way to solveyour problem-just to open amp and change few resistors ,to increase input sensitivity......

in other way-depending of your aspirations and mentioned amp's quality,maybe is good enough (for sure is easier ) to make sort of buffer-preamp-driver stage with OP,than with 4 xistors

if you are for transistors-just check in pass forum-few NS10 threads and make NS10 line stage ......hehe-just 3 transistors per channel


or
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Old 19th December 2005, 10:14 PM   #4
Zen Mod is offline Zen Mod  Serbia
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