Schematics help, what component is this?

hyperion007 · 3rd March 2010, 12:13 PM

Hi,

I am planning on building this power supply but there is one component that I don't have a clue as to what it is. I think it might be a zener diode but I'm not sure, and I don't have a clue as to what it's value should be.

I have marked it in red and would really appreciate your inputs on this.

Thanks
/Daniel

sakis · 3rd March 2010, 01:00 PM

its a zener diode

hyperion007 · 3rd March 2010, 01:45 PM

Great! But then there was the question of what values these zener diodes should be?

hyperion007 · 3rd March 2010, 02:17 PM

I found out that they are LM326-5.0 Voltage reference or LM329DZ/6.9V

gfiandy · 4th March 2010, 09:43 PM

Of those two I would think the 6.9V option would work better. As the amp is set up with a gain of 2 +/- the trim adjustment. 6.9 x 2 = 13.8 so you would need to trim the gain up only a small amount to reach 15V. If you use a 5V ref then the gain needs to be three which I think is outside the range of the circuit.

Regards,
Andrew

hyperion007 · 5th March 2010, 03:49 AM

Thanks gfiandy! As you might have noticed, I am quite new to this. If you don't mind, I'm assuming that the trimming I need to be doing is only at the VR1 and VR2 to get the desired 15V output. As it happens, I did get the 6.9V options

Thanks again Andrew!

gfiandy · 5th March 2010, 04:35 PM

Yes the trim I was refering to is that of the variable resistors VR1 and 2.

Best of luck with your build.
Andrew

hyperion007 · 5th March 2010, 07:34 PM

Thanks a lot Andrew!

3rd March 2010, 01:00 PM	#2
sakis diyAudio Member Join Date: Jan 2006 Location: nea makri athens greece	its a zener diode __________________ SERVICE ΕΝΙΣΧΥΤΩΝ ΚΑΙ ΙΑΠΩΝΙΚΩΝ ΜΗΧΑΝΗΜΑΤΩΝ ΗΧΟΥ www.eastelectronics.gr

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3rd March 2010, 01:45 PM	#3
hyperion007 diyAudio Member Join Date: Feb 2010 Location: SWEDEN	Great! But then there was the question of what values these zener diodes should be?

3rd March 2010, 02:17 PM	#4
hyperion007 diyAudio Member Join Date: Feb 2010 Location: SWEDEN	I found out that they are LM326-5.0 Voltage reference or LM329DZ/6.9V

4th March 2010, 09:43 PM	#5
gfiandy Audio Engineer diyAudio Member Join Date: Jul 2003 Location: Cambridge UK	Of those two I would think the 6.9V option would work better. As the amp is set up with a gain of 2 +/- the trim adjustment. 6.9 x 2 = 13.8 so you would need to trim the gain up only a small amount to reach 15V. If you use a 5V ref then the gain needs to be three which I think is outside the range of the circuit. Regards, Andrew

5th March 2010, 03:49 AM	#6
hyperion007 diyAudio Member Join Date: Feb 2010 Location: SWEDEN	Thanks gfiandy! As you might have noticed, I am quite new to this. If you don't mind, I'm assuming that the trimming I need to be doing is only at the VR1 and VR2 to get the desired 15V output. As it happens, I did get the 6.9V options Thanks again Andrew!

5th March 2010, 04:35 PM	#7
gfiandy Audio Engineer diyAudio Member Join Date: Jul 2003 Location: Cambridge UK	Yes the trim I was refering to is that of the variable resistors VR1 and 2. Best of luck with your build. Andrew

5th March 2010, 07:34 PM	#8
hyperion007 diyAudio Member Join Date: Feb 2010 Location: SWEDEN	Thanks a lot Andrew!