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L'Amp: A simple SIT Amp
L'Amp: A simple SIT Amp
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Old 17th October 2013, 09:35 AM   #1911
Zen Mod is offline Zen Mod  Serbia
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L'Amp: A simple SIT Amp
calculate

max output swing is ....

or - even better and easier - L'Amp is hawing how much Watts at output at 8R ...

then divide that power with Rbleed/8R ratio



(put 3W in case of 150-220R)

(or put 3 x 1K plain metal films in parallel and chill ).........
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Old 17th October 2013, 11:28 AM   #1912
Michael Rothacher is offline Michael Rothacher  United States
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L'Amp: A simple SIT Amp
The amp ideally shouldn't be turned on and off without a speaker connected anyway. The schematic includes an 8 ohm load at the output.

When you try to measure DC at the output without a speaker and or bleeder resistor connected, you are measuring the voltage on the cap which is discharging through the 1M resistance of your meter, and that will take a long, long time to reach zero.

I've mentioned all of this before here, and a note has been added to both articles.
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Old 17th October 2013, 08:39 PM   #1913
vdi_nenna is online now vdi_nenna  United States
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Quote:
I've mentioned all of this before here, and a note has been added to both articles.
Ok. I'm sorry.
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Old 17th October 2013, 09:23 PM   #1914
Michael Rothacher is offline Michael Rothacher  United States
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L'Amp: A simple SIT Amp
No worries. I just wanted to explain why you were seeing what you were seeing and take some of the mystery out.
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Old 21st October 2013, 01:52 AM   #1915
vdi_nenna is online now vdi_nenna  United States
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I have a standard Panasonic 15k cap at the output. I'd like to by-pass the cap.
I looked at couple of similar topologies (Zen 4 and Zen 9) and it appears to be OK to proceed.

Anyone try by-passing the output cap? What did you use?
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Old 23rd October 2013, 01:39 AM   #1916
drjbf1 is offline drjbf1  New Zealand
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Does anyone know the output impedance of the CCS version?
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Old 23rd October 2013, 04:45 PM   #1917
Michael Rothacher is offline Michael Rothacher  United States
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L'Amp: A simple SIT Amp
If memory serves (and it may not) it was somewhere around 4 ohms.
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Old 30th October 2013, 03:54 PM   #1918
OllBoll is offline OllBoll  Sweden
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I just looked at the ironamp which caught my interest...

I have a balanced source so I have a 10k/10k Jensen JT-11P-1 and so I wonder if I should put it in front of the simple sit as planned, or if it would be better to do the Ironamp frontend and skip the input cap, R1 and R2.
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Old 31st October 2013, 01:12 AM   #1919
Michael Rothacher is offline Michael Rothacher  United States
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L'Amp: A simple SIT Amp
Should work Easy enough to try. Mind your wiring. You might need the damping network. What say the group?
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Old 31st October 2013, 06:12 AM   #1920
2 picoDumbs is offline 2 picoDumbs  Australia
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Have you tried this baby with an Aleph current source?
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