JLH Headphone Amp - Page 25

oz7aff · 20th August 2012, 10:57 AM

Remember that when you want to put the 2 secondaries together to form at center tap, that tey must be put in series. Check that it is right by measuring the two ends, the voltage shall be twice the value of one secondaries.

mkusan · 20th August 2012, 01:13 PM

Quote:

Originally Posted by oz7aff

Remember that when you want to put the 2 secondaries together to form at center tap, that tey must be put in series. Check that it is right by measuring the two ends, the voltage shall be twice the value of one secondaries.

Thanks oz7aff,
I did measure 24V from two ends, from center tap to one secondary 11.88V, from center tap to the other secondary 12.04V. I thought that was acceptable.

Kind regards
Marko

oz7aff · 20th August 2012, 02:29 PM

That should be all right. The small differents in voltage is no problem.

robertor · 20th August 2012, 02:35 PM

little big problem: he does not want to be working at 12 volts.
work perfect with 10 volt

.

oz7aff · 20th August 2012, 04:24 PM

Then he should replace the two 12V regulators with 10V models.

Ps: in my opinion it should be running on +/- 24V

Telstar · 20th August 2012, 05:29 PM

Quote:

Originally Posted by oz7aff

Ps: in my opinion it should be running on +/- 24V

Why? Unless he has 300+Z HPs...

robertor · 20th August 2012, 06:38 PM

Quote:

Then he should replace the two 12V regulators with 10V models.

oz7aff · 20th August 2012, 10:52 PM

Quote:

Originally Posted by Telstar

Why? Unless he has 300+Z HPs...

It is just my opinion that small amp's like this one sound better on at higher voltage.

robertor · 21st August 2012, 08:44 AM

the 10 k potmeter: linear or logarithmic?

thanks.

oz7aff · 21st August 2012, 10:50 AM

Quote:

Originally Posted by robertor

the 10 k potmeter: linear or logarithmic?

thanks.

For Audio one normaly use a Logarithmic potentiometer.

If you only have a linear type, then take a look here:

ESP - A Better Volume Control

20th August 2012, 02:35 PM	#244
robertor diyAudio Member Join Date: Nov 2007	little big problem: he does not want to be working at 12 volts. work perfect with 10 volt . __________________ rob

21st August 2012, 08:44 AM	#249
robertor diyAudio Member Join Date: Nov 2007	the 10 k potmeter: linear or logarithmic? thanks. __________________ rob

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20th August 2012, 10:57 AM	#241
oz7aff diyAudio Member Join Date: May 2012 Location: Denmark	Remember that when you want to put the 2 secondaries together to form at center tap, that tey must be put in series. Check that it is right by measuring the two ends, the voltage shall be twice the value of one secondaries.

20th August 2012, 02:29 PM	#243
oz7aff diyAudio Member Join Date: May 2012 Location: Denmark	That should be all right. The small differents in voltage is no problem.

20th August 2012, 04:24 PM	#245
oz7aff diyAudio Member Join Date: May 2012 Location: Denmark	Then he should replace the two 12V regulators with 10V models. Ps: in my opinion it should be running on +/- 24V