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Old 3rd March 2010, 12:13 PM   #1
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Default Schematics help, what component is this?

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
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Old 3rd March 2010, 01:00 PM   #2
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its a zener diode
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Old 3rd March 2010, 01:45 PM   #3
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Great! But then there was the question of what values these zener diodes should be?
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Old 3rd March 2010, 02:17 PM   #4
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I found out that they are LM326-5.0 Voltage reference or LM329DZ/6.9V
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Old 4th March 2010, 09:43 PM   #5
gfiandy is offline gfiandy  United Kingdom
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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
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Old 5th March 2010, 03:49 AM   #6
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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!
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Old 5th March 2010, 04:35 PM   #7
gfiandy is offline gfiandy  United Kingdom
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Yes the trim I was refering to is that of the variable resistors VR1 and 2.

Best of luck with your build.
Andrew
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Old 5th March 2010, 07:34 PM   #8
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Thanks a lot Andrew!
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