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Old 15th February 2013, 06:23 PM   #1
Jempie is offline Jempie  Indonesia
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Default Single Ended Solid state preamp

Im looking for an single ended solid state preamp only with one transistor design.

I have looked everywere to see if there is an design with only one transistor
use in an line preamp. does it exist
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Old 15th February 2013, 06:25 PM   #2
Mooly is offline Mooly  United Kingdom
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You have to define things a bit more. Do you want gain with this preamp or is it just to be a "buffer" ?
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Old 15th February 2013, 06:26 PM   #3
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What you need is a common emitter (or common gate) stage. These are very basic, and google will turn up a lot of examples.

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Old 15th February 2013, 06:34 PM   #4
Jempie is offline Jempie  Indonesia
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i have a lot of KT603A
i also need gain
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Old 15th February 2013, 07:15 PM   #5
Mooly is offline Mooly  United Kingdom
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That appears to be an NPN transistor. To make a one transistor amplifier we would need to know the supply voltage and the gain needed. Also using one transistor means the design will have several compromises such as fairly high output impedance.
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Old 15th February 2013, 07:40 PM   #6
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J-fet BOZ.
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Old 15th February 2013, 11:52 PM   #7
Jempie is offline Jempie  Indonesia
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Not an amplifier but an preamplifier
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Old 16th February 2013, 05:57 AM   #8
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A simple common emitter stage like in the pic attached will work. The 2n2219 is supposed to be nearly the same as KT603A. The distortion is going to be quite high, 5% at 2 volts rms out. Of course it will require a regulated supply or noise will be an issue as well.
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Old 16th February 2013, 11:29 AM   #9
Jay is offline Jay  Indonesia
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Quote:
Originally Posted by Jempie View Post
Not an amplifier but an preamplifier
JFET-BOZ is a preamp. It uses NJFET instead of NPN. If you have many NPNs, why do you want a single transistor preamp? NPN/BJT is not suitable for single ended gain stage. There's nothing wrong with two or more transistor, would you think so?

BTW, I always buffer the input of my low power chip amps with NPN-BJT. The chip amp uses single ended supply, so low that very low noise NPN can be used (many of them have maximum Vce of 15V). Schematic topology is similar to what Jerluwoo posted except that output is taken from emitter (instead of collector). My favorite NPN for this purpose is gold plated 2N2222A.

EDIT: For more than one transistor you'll need PNP. Sorry. But eww... they are cheap.

Last edited by Jay; 16th February 2013 at 11:41 AM.
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Old 16th February 2013, 12:42 PM   #10
Mooly is offline Mooly  United Kingdom
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Why would you need a PNP to use more than one transistor ?
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