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DLH Amplifier: The trilogy with PLH and JLH amps
DLH Amplifier: The trilogy with PLH and JLH amps
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Old 26th August 2017, 02:40 AM   #1
diegomj1973 is offline diegomj1973  Argentina
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Default DLH Amplifier: The trilogy with PLH and JLH amps

This very simple design has all the ingredients to satisfy even the most demanding DIYers. The output power in pure class A operation is 15.52 W at 2 ohms and 1 KHz, or 7.76 W at 4 ohms and 1 KHz, or 3.88 W at 8 ohms and 1 KHz. THD is only 0.025 % at 15.52 W and 1 KHz (2 ohms). THD is only 0.0024 % at 7.76 W and 1 KHz (4 ohms). THD is only 0.00091 % at 3.88 W and 1 KHz (8 ohms). Voltage gain = 8,9 dB.

Only two stages. Four transistors. Very few components. Its performance is surprisingly good, despite its total simplicity.

High bandwidth. Ultra low distortion. Input in single ended configuration. Output in single ended or push pull configuration, entirely adjustable by the position of a trimpot. PSRR: 61 dB across the entire audio bandwidth.

I want to hear comments from those who intend to build this simple amplifier.

regards

Click the image to open in full size.

Click the image to open in full size.

Here are the first dirty tests. The microphone does not reveal all its high quality. The tests were between 1A and 1.3A of bias current, levels at which the amplifier should give lower quality than stipulated. The loudspeaker impedance tests = 4 ohms:

Amplificador HDC 20W (Clase A) Parte 4 - YouTube
Amplificador HDC 20W (Clase A) Parte 5 - YouTube
Amplificador HDC 20W (Clase A) Parte 3 - YouTube
Amplificador HDC 20W (Clase A) Parte 2 - YouTube
Amplificador HDC 20W (Clase A) - YouTube
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File Type: jpg DLH Amplifier.jpg (119.7 KB, 3740 views)
File Type: png Fourier Analysis at 1W 8 ohms.png (29.5 KB, 3685 views)

Last edited by diegomj1973; 26th August 2017 at 01:25 PM.
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Old 26th August 2017, 01:57 PM   #2
diegomj1973 is offline diegomj1973  Argentina
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DLH Amplifier: The trilogy with PLH and JLH amps-transient-analysis-jpg
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Old 26th August 2017, 02:56 PM   #3
diegomj1973 is offline diegomj1973  Argentina
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DLH Amplifier: The trilogy with PLH and JLH amps-thd-vs-frecuency-jpg
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Old 26th August 2017, 06:23 PM   #4
diegomj1973 is offline diegomj1973  Argentina
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DLH Amplifier: The trilogy with PLH and JLH amps-thd-vs-output-power-jpg
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Old 26th August 2017, 07:09 PM   #5
diegomj1973 is offline diegomj1973  Argentina
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DLH Amplifier: The trilogy with PLH and JLH amps-psrr-vs-frecuency-jpg
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Old 27th August 2017, 01:34 AM   #6
diegomj1973 is offline diegomj1973  Argentina
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DLH Amplifier: The trilogy with PLH and JLH amps-imd-2-ohms-jpg
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Old 27th August 2017, 04:24 AM   #7
Jonathan Bright is offline Jonathan Bright  Australia
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Thank you. I have a 1969 JLH. Interested in Mosfet alternatives.
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Old 27th August 2017, 10:13 AM   #8
Bonsai is offline Bonsai  Europe
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Wow - very nice simple circuit Diego with great performance!

What's the DC stability like - both Iq and output voltage?
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Old 27th August 2017, 12:34 PM   #9
Ketje is offline Ketje  Belgium
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Looks interresting but 60W in for only 16W out (said the tube lover )
You could try this, just an idea
The diodes are for zero-out temp.compensation.
Mona
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Old 27th August 2017, 01:25 PM   #10
diegomj1973 is offline diegomj1973  Argentina
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Many thanks Jonathan Bright, Bonsai and Ketje.

In relation to compensation, I had thought something like this:

DLH Amplifier: The trilogy with PLH and JLH amps-posible-esquema-para-la-compensaci-del-offset-de-salida-con-la-temperatura-png

I have not tried this same subcircuit, although in simulations it shows perfect compensation with temperature.

The circuit of the first post is a basic circuit. As it is shown in the first post has been tested in the videos. Everything can be improved, although as well as it is performs in impressive form.

Regards

Last edited by diegomj1973; 27th August 2017 at 01:45 PM.
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