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Salas SSLV1.3 UltraBiB shunt regulator
Salas SSLV1.3 UltraBiB shunt regulator
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Old 16th June 2018, 09:30 PM   #241
sontero is offline sontero  Italy
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Hi Mr. Salas
I have a very simple request.
I would like to use the new shunt on the M.Rotacher MoFo amplifier in its Big declination to deliver about 2.5A continuous on a 24V-DC voltage.
It's possible ?
With which precautions?

I have already built several shunts on your projects with great satisfaction.
Reflektor-D for my DAC
DCB1 and others.
Naturally, in previous situations I did not need high currents.
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Old 17th June 2018, 01:16 AM   #242
Salas is offline Salas  Greece
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Salas SSLV1.3 UltraBiB shunt regulator
How much is the peak to peak current that amp will ask for max signal output?
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Old 17th June 2018, 07:41 AM   #243
sontero is offline sontero  Italy
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Quote:
Originally Posted by Salas View Post
How much is the peak to peak current that amp will ask for max signal output?
the Mofo is an amp source follower in class A that has no gain and is loaded by a large inductance on the source. The maximum current is set at 2.5A and B + 24V.
the schematic in attachement
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File Type: png MoFo schematic.png (33.7 KB, 159 views)
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Old 17th June 2018, 03:35 PM   #244
Salas is offline Salas  Greece
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Salas SSLV1.3 UltraBiB shunt regulator
Anyways with IRF9640 M1 & IRF640 M2 it may do it. The burden is on M1 that will burn the voltage drop across the reg times the CCS setting constantly. That will be 15W if set at 3A assuming 5VDC across. M2 has it better with a high bias Class A amp as load because it will just burn the excess while the amp will pull the heavy part. You will see the reg's LEDS blink if the CCS is set low for the amp's needs with some speaker on peaks. Start with R1 0.22R 5W for circa 2.7A CC. Use a sink for M1 & M2 that will be at ease with at least 20W constantly.
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Old 17th June 2018, 03:53 PM   #245
sontero is offline sontero  Italy
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Quote:
Originally Posted by Salas View Post
Anyways with IRF9640 M1 & IRF640 M2 it may do it. The burden is on M1 that will burn the voltage drop across the reg times the CCS setting constantly. That will be 15W if set at 3A assuming 5VDC across. M2 has it better with a high bias Class A amp as load because it will just burn the excess while the amp will pull the heavy part. You will see the reg's LEDS blink if the CCS is set low for the amp's needs with some speaker on peaks. Start with R1 0.22R 5W for circa 2.7A CC. Use a sink for M1 & M2 that will be at ease with at least 20W constantly.
Good !!
many Thanks Salas
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Old 17th June 2018, 05:19 PM   #246
Salas is offline Salas  Greece
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Salas SSLV1.3 UltraBiB shunt regulator
Watch where the main current goes when you will be setting it up though. You would either need a 100W 10R dummy load (sinked power resistor) or the amp itself hooked up because 65W will dissipate on M2 (24V @ 2.7A) frying it if there is no way out for the bulk of that bias!
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