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The simplistic Salas low voltage shunt regulator
The simplistic Salas low voltage shunt regulator
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Old 24th June 2018, 12:29 PM   #7761
coolnose is offline coolnose  Europe
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Hi all,

not sure if this thread is the appropriate one, but I found a full set of black V1.1 boards in my drawer including a mini-kit , now I would like to put it to use...

Could someone point me to a source for the jfets and/or alternatives ? I do have 2SK30A (but read that they are not the best choice) and could of course get 2SK170....

Any input is appreciated.

Max
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Old 24th June 2018, 12:32 PM   #7762
Salas is offline Salas  Greece
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The simplistic Salas low voltage shunt regulator
I replied to your same question in the 1.1 GB thread to look into Kessler Electronic Germany for 2SK117GR
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Old 24th June 2018, 12:39 PM   #7763
coolnose is offline coolnose  Europe
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Thank you, I missed your post in the other thread!

Will proceed and revert!
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Old 26th August 2018, 06:13 PM   #7764
rhythmsandy is offline rhythmsandy
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Hi salas what are the considerations when using Jfets of higher IDSS like BL series with 6 to 14ma of IDSS? Are there any values to change?
I have made one with 2sk880GR but what Im getting is just the CCS through the big resistor at the input but the output is zero and I tried that on both positive and negative regs and found both have same issue that output is zero. Checking the reference voltage at Zener is also zero. Couldnt understand what has happened but the output seems shorted Im suspecting something wrong with the Jfets which are SOT package tiny ones. Is there anything to consider when using 2sk880BL series which has higher IDSS? Like changing the source resistor or so?
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Old 26th August 2018, 06:40 PM   #7765
Salas is offline Salas  Greece
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The simplistic Salas low voltage shunt regulator
Point me at the schematic you work on because there are many versions.
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Old 27th August 2018, 03:37 AM   #7766
rhythmsandy is offline rhythmsandy
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this one
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Old 27th August 2018, 04:17 AM   #7767
Salas is offline Salas  Greece
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The simplistic Salas low voltage shunt regulator
Using BL you may bring their mA down with resistors. Make R4 R5 both 100R for value and bring Q5 Q6 gates to ground. Reversed in the negative section as a JFET & ressitor whole of course. Also put a 100R at the source of Q2 and keep its gate on Q3's collector where that resistor will connect its other side. Reversed as a whole in a negative section again.

You mentioned using a Zener, that one should be oriented in reverse regarding its cathode vs the LEDS shown in the above. Also a Zener will take much more uF value in C1 for effective filtering (higher than 6.8V Zeners, especially when at below 7.5mA operating current are noisy, and they keep on climbing for noise with the less mA is used to bias them).
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Old 30th August 2018, 01:41 PM   #7768
shattered_dream is online now shattered_dream  Germany
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One question.. I have a toroid with 2x15Vac... Can I use this one for 15V DC?
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Old 30th August 2018, 02:37 PM   #7769
Salas is offline Salas  Greece
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The simplistic Salas low voltage shunt regulator
Yes you can
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Old 30th August 2018, 08:58 PM   #7770
shattered_dream is online now shattered_dream  Germany
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Sorry was 18v not 15
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