Transformer as a voltage gain element

Borat · 2nd September 2009, 01:16 PM

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.

revintage · 2nd September 2009, 01:31 PM

This has allready been done. Google for Susan Parker + Zeus amp. There is also a long thread in this subject at Solid State.

Borat · 2nd September 2009, 01:43 PM

Quote:

Originally Posted by revintage

There is also a long thread in this subject at Solid State.

i can haz link ?

revintage · 2nd September 2009, 01:44 PM

Use "Search"!

Borat · 2nd September 2009, 02:14 PM

i guess this is it:

Zero Feedback Impedance Amplifiers

her post also precedes my join date on partsexpress.

good work.

Borat · 2nd September 2009, 02:32 PM

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.

Gordy · 2nd September 2009, 02:39 PM

Quote:

Originally Posted by Borat

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).

Borat · 2nd September 2009, 02:59 PM

Quote:

Originally Posted by Gordy

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.

Steve Eddy · 2nd September 2009, 03:18 PM

Quote:

Originally Posted by Borat

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

Diomedian · 2nd September 2009, 03:59 PM

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

2nd September 2009, 01:16 PM	#1
Borat Banned Join Date: Aug 2009 Location: Silicon Valley & NYC	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.

2nd September 2009, 01:31 PM	#2
revintage diyAudio Member Join Date: May 2007 Location: Eskilstuna, Sweden	This has allready been done. Google for Susan Parker + Zeus amp. There is also a long thread in this subject at Solid State. __________________ Brgds Lars

2nd September 2009, 01:44 PM	#4
revintage diyAudio Member Join Date: May 2007 Location: Eskilstuna, Sweden	Use "Search"! __________________ Brgds Lars

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2nd September 2009, 02:14 PM	#5
Borat Banned Join Date: Aug 2009 Location: Silicon Valley & NYC	i guess this is it: Zero Feedback Impedance Amplifiers her post also precedes my join date on partsexpress. good work.

2nd September 2009, 02:32 PM	#6
Borat Banned Join Date: Aug 2009 Location: Silicon Valley & NYC	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.

2nd September 2009, 03:59 PM	#10
Diomedian diyAudio Member Join Date: Nov 2004 Location: Halifax, N.S.	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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