Cmoy power supply simple question

wiredmonkey · 16th July 2007, 11:12 PM

Hi all,

I've just put together a basic cmoy headphone amp with an opa2134. My problem has come from the power supply where the voltage divider is not, well, dividing equally. I have two 4k7 resistors in series with 100uF caps in parallel with those. The voltage readings from an 18V (bench lab) supply reads approx +16V across the first resistor and -2V across thge other. Any help would be greatly appreciated!

Thanks!

wiredmonkey · 17th July 2007, 12:58 AM

Hrrrrm so I forgot to cut the tracks in between the parallel pins on the opamp! Very embarrassing!!! How do I check that my opa2134's are okay?

The voltage divider seems to still be unbalanced (-8V & 11V)

Oh, and the input is the same as the output - Is the amp now a fancy looking short on a board?

Juergen Knoop · 17th July 2007, 01:44 AM

pull the opamp, and check the voltages without it
probably it is not damaged and there are still wiring errors on the board
I always try my new circuits with a cheap ic like TL072 first, I still get upset when 'loosing' parts, especially expensive ones

regards

16th July 2007, 11:12 PM	#1
wiredmonkey diyAudio Member Join Date: Dec 2006	Cmoy power supply simple question Hi all, I've just put together a basic cmoy headphone amp with an opa2134. My problem has come from the power supply where the voltage divider is not, well, dividing equally. I have two 4k7 resistors in series with 100uF caps in parallel with those. The voltage readings from an 18V (bench lab) supply reads approx +16V across the first resistor and -2V across thge other. Any help would be greatly appreciated! Thanks!

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17th July 2007, 12:58 AM	#2
wiredmonkey diyAudio Member Join Date: Dec 2006	Hrrrrm so I forgot to cut the tracks in between the parallel pins on the opamp! Very embarrassing!!! How do I check that my opa2134's are okay? The voltage divider seems to still be unbalanced (-8V & 11V) Oh, and the input is the same as the output - Is the amp now a fancy looking short on a board?

17th July 2007, 01:44 AM	#3
Juergen Knoop diyAudio Member Join Date: Jan 2007 Blog Entries: 3	pull the opamp, and check the voltages without it probably it is not damaged and there are still wiring errors on the board I always try my new circuits with a cheap ic like TL072 first, I still get upset when 'loosing' parts, especially expensive ones regards

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