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Old 2nd September 2009, 01:16 PM   #1
Borat is offline Borat  United States
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Default Transformer as a voltage gain element

A while ago ago i had an idea - an amplifier that uses solid state devices for current gain and transformers for voltage gain.

there would be ZERO voltage gain from any active device. all the voltage gain would come only from transformers.

theoretically such an amp could be fairly linear without any feedback - no ?

what i was told then ( at partsexpress.com ) is that there is no need for this because you can simply use an op-amp to get all the clean gain you want. i am hoping on this forum i will get a more intelligent answer

there would be no input or output transformers by the way. all the transformers would be internally used for gain.
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Old 2nd September 2009, 01:31 PM   #2
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This has allready been done. Google for Susan Parker + Zeus amp. There is also a long thread in this subject at Solid State.
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Old 2nd September 2009, 01:43 PM   #3
Borat is offline Borat  United States
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Quote:
Originally Posted by revintage View Post
There is also a long thread in this subject at Solid State.
i can haz link ?
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Old 2nd September 2009, 01:44 PM   #4
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Use "Search"!
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Old 2nd September 2009, 02:14 PM   #5
Borat is offline Borat  United States
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i guess this is it:

Zero Feedback Impedance Amplifiers

her post also precedes my join date on partsexpress.

good work.
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Old 2nd September 2009, 02:32 PM   #6
Borat is offline Borat  United States
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actually i take it back - her design is different.

she uses transformers at input and output and transistors in the middle.

i was proposing the use of transistors at input and output and transformer in the middle.
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Old 2nd September 2009, 02:39 PM   #7
Gordy is offline Gordy  United Kingdom
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Quote:
Originally Posted by Borat View Post

i was proposing the use of transistors at input and output and transformer in the middle.
Good idea; let's see your proposed circuit.

(You might want to transfer this thread to the Solid State part of the forum).
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Old 2nd September 2009, 02:59 PM   #8
Borat is offline Borat  United States
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Originally Posted by Gordy View Post
Good idea; let's see your proposed circuit.

(You might want to transfer this thread to the Solid State part of the forum).
i don't know how to build or design amplifiers

as far as moving the thread i don't think i can do it ? mods feel free though.
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Old 2nd September 2009, 03:18 PM   #9
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Quote:
Originally Posted by Borat View Post
i was proposing the use of transistors at input and output and transformer in the middle.
If you can control what the driving source is in terms of output impedance, maximum output voltage and DC offset, you can simplify it to a transformer at the input and transistors at the output.

se
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Old 2nd September 2009, 03:59 PM   #10
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Why not try placing say a 10:1 transformer in front of a First Watt F4 (PCBs are available). If it doesn't work, well then at least you'll have an F4.

-j
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