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JSR03 at 11 V using a LM329

Started by peranders, March 16, 2010, 05:00:39 PM

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peranders

Here is a suggestion for achieving 11 V out together with a LM329:
Not mounted:
T1, T3, T5
R4, R5, R6, R12
C9


R1 = 1k0
R2 = 3k9
R3 = 2k2
R7 = 470R
R8 = 1k0
R9 = 1k8
R10 = jumper (wire from a resistor)
R11 = 47R
R13 = 2k2 to 5k6
R14 = 220R (100R may be a bit hard for T6 but should work)

These calculations gives 10.8 V out but can differ since the tolerance of the LM329 is 5%.
/Per-Anders Sjöström, owner of this forum

Homepage with my DIY hifi stuff

Branko

Thank you!

Are these calculations for use wit a blue or red LED?

Branko

peranders

#2
Red LED, altough I had in mind the blue but when I came to think about it you must increase the preregulator voltage to perhaps 5 volts. R2 = 3k9 See my edited first post.
/Per-Anders Sjöström, owner of this forum

Homepage with my DIY hifi stuff

Branko

Hi

yust to make things clear. You say:

Here is a suggestion for achieving 11 V out together with a LM329:
Not mounted:
T1, T3, T5
R4, R5, R6, R12
C9

Does that mean T2 T4 T6 should be used instead or no T1 to T6 at all? If so could I use T1 T3 T5 (because i have these)

thx

BRanko

peranders

Yes, only one transistor at each position. See the schematics.
/Per-Anders Sjöström, owner of this forum

Homepage with my DIY hifi stuff

Branko

Hi,

is it ok to use a bc860b instead a bc860c

Thx

Branko

peranders

/Per-Anders Sjöström, owner of this forum

Homepage with my DIY hifi stuff

Branko

Hi,

build it yesterday and a short test gave me 10,8 V :)

Is there any way to get 1400 to 1500 mA out of one JSR03 (cooling?)

thx

Branko


peranders

It might work but this is the limit for the LM317. You might also increase the current through R14.
/Per-Anders Sjöström, owner of this forum

Homepage with my DIY hifi stuff

Branko

Hi,

today I tried to use the regulator for the first time.

Without load the output voltage is 10,8 V, but with load it drops to 3,8 V (also if I connect the load (DAC 1400 mA) the current at the pos/neg out of the rfb02 drops from 25 to 16 V with a 2x 18 V toroidal transformer in front). The cooling pad for the LM317 reaches 70 C.

What now (I did not increase the current through R14 yet).

Branko

peranders

#10
How much smoothing caps do you have? What about the VA rating of the transformer? If you plan to take out 1.5 A the transformer must have 2.5-3.0 A as rating.
/Per-Anders Sjöström, owner of this forum

Homepage with my DIY hifi stuff

Branko

Hi,

at the moment there is no smoothing cap (have one with 4700 uF waiting). the VA rating of the transformer is 2 x 18 V 2 x 1,39 A

thx

Branko

peranders

You must of course have smoothing.
/Per-Anders Sjöström, owner of this forum

Homepage with my DIY hifi stuff

Branko

Hi,

OK i'll try now with the 4700 uF Elko i have. Is the type or quality 0f cap important (elko, polypropylene ...)? should it be near by rfb02 or the SJR03?

thx

Branko

Branko

Hi,

I've put in the 4700 uF smoothing cap and the voltage with load is now 4,2 V without load 10,8 V (without smoothing 3,8 V an 10,8 V)

What to do?

thx

Branko