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Old 16th January 2012, 05:47 PM   #461
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Yes, the I/V resistors dictate the output impedance.
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Old 16th January 2012, 08:17 PM   #462
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Hi Russ,
I took out the big teflons and reverted back to the original 2.2nF Wimas and they, of course do not get hot any more BUT....the Legato consumption didn't change much! I measured it before teflons and after and it's around 430mA - 80mA more than you stated in the Manual. I measure the total current both Placids are supplying and then subtract all the shunted currents - is this correct? What should cause the Legato to drain more than 350mA, please?
Thank you!
Ivo
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Old 16th January 2012, 08:24 PM   #463
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To long leads from supply ? Maybee it will force the Legato into oscillation ?

Mine is not so hot as others report .
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Old 16th January 2012, 08:39 PM   #464
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Since I am powering Legato with two Placids the second one has longer twisted power leads but can they really cause oscillations, please? Is there a way I can tell without a scope?

Edit: Just to add the Legato is playing really nice - just a bit edgy and glassy sometimes but hope it will get softer after some burn-in?

Last edited by natzev_i; 16th January 2012 at 08:42 PM.
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Old 16th January 2012, 09:01 PM   #465
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Do you have small caps 100 - 220 uf right at the output on the placids ?
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Old 16th January 2012, 09:09 PM   #466
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Quote:
Originally Posted by natzev_i View Post
Hi Russ,
I took out the big teflons and reverted back to the original 2.2nF Wimas and they, of course do not get hot any more BUT....the Legato consumption didn't change much! I measured it before teflons and after and it's around 430mA - 80mA more than you stated in the Manual. I measure the total current both Placids are supplying and then subtract all the shunted currents - is this correct? What should cause the Legato to drain more than 350mA, please?
Thank you!
Ivo
Yes, something might be wrong here. 430mA is at the high side. What voltages are you supplying?

To compare, I'm using 180ohm (stock is 150ohm) and is running at +-12.5v. Mine is consuming 165mA (and I like the less heat a lot more). Mine is with the buffer.
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Old 16th January 2012, 09:19 PM   #467
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Quote:
Originally Posted by Erlend Sæterdal View Post
Do you have small caps 100 - 220 uf right at the output on the placids ?
I have two stock Placids BP - one is HD supplying the I/V stage and the other is the older 2.1.2 version for the BAL/SE part. I didn't put any additional caps on the outputs - do I need to?
All voltages are +14.5 and -14.0V and shunted currents around 60-65mA
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Old 16th January 2012, 09:21 PM   #468
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Originally Posted by avr300 View Post
....Mine is consuming 165mA (and I like the less heat a lot more). Mine is with the buffer.
You mean 165mA per rail and 330mA total?
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Old 16th January 2012, 09:28 PM   #469
avr300 is offline avr300  Denmark
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165 mA at positive rail - and 190mA at negative rail. Measured right now
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Old 16th January 2012, 09:42 PM   #470
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Congratulations then, you are spot on!
As Erlend suggested I will try tomorrow shorter power leads and thicker wire and see if that will change something.
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