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Problems with Neplus NE116 audio amplifier

Ondrejdzablo

Jan 20, 2023
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I recently built this ne116 audio amplifier DIY circuit but i don't know how to power it with my power suply.
I know it sound stupid but i tried everything and it just don't work.IMG_20230120_203247.jpg
 

kellys_eye

Jun 25, 2010
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What 'is' your power supply?

Is should be capable of providing a SPLIT RAIL output i.e. +V, ground and -V (anywhere from +/-10V to +/-45V) in the configuration you've shown. It will also have to be able to deliver up to a few AMPS current (depends on the power output you're going to expect/use).
 

Ondrejdzablo

Jan 20, 2023
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What 'is' your power supply?

Is should be capable of providing a SPLIT RAIL output i.e. +V, ground and -V (anywhere from +/-10V to +/-45V) in the configuration you've shown. It will also have to be able to deliver up to a few AMPS current (depends on the power output you're going to expect/use).
Thank you for your answer it. I used +/-10V transformer with diode bridge rectifier. When i conected 6600uF caps to 0V split rail it worked however it used only about 0.6A and the sound quality wasn't that good. Now I'm considering using preamplifier but I'm afraid it will be too much for TDA7250
(I was using signal from phone in previous test).
 

Ondrejdzablo

Jan 20, 2023
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Ukážte schému.

Aký je výkon vášho transformátora, tj aký prúd môže dodať?

takze problem je...........?
The transformer is able to supply more than 10A and the problem is that the amplifier only supply around 12W while it should supply around 200W.IMG_20230121_180409.jpg
 

kellys_eye

Jun 25, 2010
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Why are you using +/-10V transformer when the circuit calls for +/-25V?

You won't get maximum output unless you use the correct power supply.
 

Ondrejdzablo

Jan 20, 2023
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Why are you using +/-10V transformer when the circuit calls for +/-25V?

You won't get maximum output unless you use the correct power supply.
In other paper it says that minimal voltage is +/- 10V. At first i thougt the low voltage but when i conected it on +/-16V there wasn't any difference.
 

kellys_eye

Jun 25, 2010
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Datasheet says output power at +/-30V is 40W into an 8ohm load with a 1V pk-pk input signal level. Anything outside these parameters and you won't get the performance you expect. +/-16V might see 20W.

What level is your input signal?
 

Ondrejdzablo

Jan 20, 2023
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I measured peak to peak voltage and it was only about 0.25V
I also increased supply voltage to +/-21V and the power with 4ohm speakers was about 80W
 
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