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Old 19th February 2021, 11:51 AM   #681
alexanderbax is offline alexanderbax
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Quote:
Originally Posted by Salas View Post
Second case is borderline. Dependent on the transformer's regulation percentage and load current asked. You should check if at least 2.5V DC remains across the D11 diode when on the actual application.
Thanks, Salas. Current draw will be around 450ma so not a lot. Will definitely check the DC voltage across the diode on load just to check its stable
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Old 19th February 2021, 12:02 PM   #682
Salas is offline Salas  Greece
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Alright, let us know.
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Old 25th February 2021, 05:13 PM   #683
johnm is offline johnm  United Kingdom
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What fuse should one use in the IEC mains inlet socket please? I'm powering a RPi4 which also powers an external SSD. I'm assuming peaks of not more than 3-4A, so would a 4A fast blow be the best bet here? Thanks.
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Old 25th February 2021, 05:32 PM   #684
Salas is offline Salas  Greece
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You should choose a slow blow primary side fuse based on your transformer's VA rating. That's not to be blowing the fuse by the transformer's inrush current capability at turn on. Primary current is less than secondary current in a step down transformer.

What is your VA? For 230-240V primary and 50VA use around 600mA slow blow. For 100VA around 1.25A.
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Old 25th February 2021, 08:10 PM   #685
johnm is offline johnm  United Kingdom
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Thanks foe explaining that Salas. Yes it's indeed a 50VA - 600mA fuses ordered
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Old 19th March 2021, 09:34 AM   #686
ForsbackaKalle is offline ForsbackaKalle  Sweden
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Sorry for a silly question. But the LM334 has V+, V- and adjust. 3 pins. How shall it be connected?
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Old 19th March 2021, 09:42 AM   #687
Salas is offline Salas  Greece
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V+ pin to rail, Rset (12R) between R V- pins, V- pin to LEDS.
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Old 23rd March 2021, 01:53 PM   #688
ForsbackaKalle is offline ForsbackaKalle  Sweden
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Thanks for fast responce. Another question. If I use other leds, like typical round red 3mm leds with about similar 1,9-2 forward voltage. Is it ok?
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Old 23rd March 2021, 09:37 PM   #689
Salas is offline Salas  Greece
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Should be ok. If they have published specs check their Vf voltage at around 5mA not the usual 20mA nominal value.
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Old 27th March 2021, 05:11 PM   #690
Harolda is offline Harolda  Netherlands
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I just bought a few boards and mini kits from TeaBag. I am looking at building in total 4 psu's. I will start with a 12V version for a RME ADI2 DAC.
Looking at the transformers I see that most have 2 secondaries. Now i found a 100VA toroid with a single 14.5V secondary and 6.9A. I think this would be perfect for a 12V L-adapter.
I am also looking for a enclosure with heat sinks. Anything else I need to take into consideration?

And would transformers with 2 secondaries be a problem?


regards,

Harold
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