laboratory audio amplifier

[Niculian]

Hello,
I need a laboratory audio amplifier 10-30W who can deliver the same square signal between 10Hz and 100KHz without deformation IN/OUT. Unsuccessful so far and I already made and test 3 different types.
Will be possible to achieve what I need? Maybe is not possible ? Anyone can suggest a schema which can work? Thanks for any answer !

 

[OldDIY]

What else should he be able to? Give the full specification.

 

[rayma]

For a good 100kHz square wave, you would need 1MHz bandwidth at full power.
Is this for use at 8 ohms? Are you sure that's what you want?
Krohn-Hite Widebnd Power Amplifiers

 

[OldDIY]

A digital amplifier can be used to amplify square wave.

 

[OldDIY]

If you need a linear amplifier, suitable Class A JLH2003 with high frequency BJT.

 

[Niculian]

Yes is for 8 ohms, about specifications, I'm only interested to have a perfect square wave on output from 10Hz to 70KHz (better 100KHz) at mini 10W-30W

 

[jan.didden]

Winfield Hill's amp does that, out to several MHz, perfect 100kHz square wave.

But such an amp is NOT a 'simple' audio amp, there is considerable difficulty and complexity to get that type of performance.
Only diy if you are a very experienced electrical engineering type of guy. Are you?


Jan

 

[OldDIY]

Will there be a linear (sinusoidal) signal, or only square-wave pulses?
2003 can be modified for your specification.
https://aliexpress.ru/item/32819329...earchweb0_0,searchweb201602_,searchweb201603_

 

[Niculian]

will be use with sinusoidal signal but most of the time with square wave. I'm happy if I have 10Hz to 50KHz. I have test Hiraga, Aleph and other amplifiers but is not working how I need. Winfield Hill's is not what I was thinking when I decided to diy a measure amplifier.

 

[OldDIY]

General idea (I don’t know if it’s suitable or not)))
Some refinement required - Fall Front Damage
Усилитель JLH (John Linsley-Hood)

 

[OldDIY]

Old gold (like Quad405) - make on modern OPAmp and BJT
Стр. 59 журнала <<Радио>> № 4 за 1977 год

 

[spladski]

DC to 1MHz. The thread has sq wave pics.

First One - mosfet amplifier module

 

[Niculian]

thanks to all ! I think the First One will do the job. You know if I can Buy somewhere the PCB or ready done? I have sent a message to First One on Facebook but I think is not working anymore.