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Salas SSLV1.3 UltraBiB shunt regulator
Salas SSLV1.3 UltraBiB shunt regulator
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Old 25th March 2019, 01:04 AM   #1321
Salas is offline Salas  Greece
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Salas SSLV1.3 UltraBiB shunt regulator
That's not much spare current to warrant high value R9. Odd. Do you see any LEDs blinking at start up? Also how long is the output wiring?
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Old 25th March 2019, 01:13 AM   #1322
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Salas SSLV1.3 UltraBiB shunt regulator
For a basic check measure that the drop across R1 is about 0.6V and not momentarily unstable during start up, also measure Q2 & Q3 Vbe, mV drop across R7, and let me know
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Old 25th March 2019, 01:18 AM   #1323
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No LED blinking. Wiring is around 10cm. I'll test it with another DVM tomorrow, just to confirm that it's really happening.
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Old 25th March 2019, 01:23 AM   #1324
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Salas SSLV1.3 UltraBiB shunt regulator
Utilize the DMM's min max function while powering up. Best is to set the scope very slow on DC coupling and trigger at say 1V. Set it on single mode also and then power up. It should capture the ramp up shape.
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Old 25th March 2019, 01:24 AM   #1325
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Quote:
Originally Posted by Salas View Post
For a basic check measure that the drop across R1 is about 0.6V and not momentarily unstable during start up, also measure Q2 & Q3 Vbe, mV drop across R7, and let me know
Will do that tomorrow.
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Old 25th March 2019, 01:27 AM   #1326
Salas is offline Salas  Greece
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Salas SSLV1.3 UltraBiB shunt regulator
When all is well, to charge C2 up to Vout with only about 2mA available as Vref's local CCS (J2, R7) makes this reg obligatory soft-start.
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Old 25th March 2019, 05:41 PM   #1327
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OK, so got my scope out of storage and there is no turn-on overshoot. Don't know what is going on with the DVM, but it has been somewhat erratic for a while.

Anyway, many thanks for your assistance, it really is a superb reg, and I've tried a few.
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Old 25th March 2019, 06:54 PM   #1328
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Salas SSLV1.3 UltraBiB shunt regulator
Thanks for the feedback and all the best to you
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Old 29th March 2019, 08:53 PM   #1329
pistollero is offline pistollero  Portugal
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Hello all,

Just to report that i put one ultrabib power supply at work 5v on my dac in the analog vref part and sounds very good.

Regarding feeding digital 5v circuits is ultrabib better than reflektor theoretically or vice versa ?
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Old 29th March 2019, 09:06 PM   #1330
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Salas SSLV1.3 UltraBiB shunt regulator
Subjective. Trust your liking.
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