JSR03 at 11 V using a LM329

[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%.

[Branko]

Thank you!

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

Branko

[peranders]

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.

[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.

[Branko]

Hi,

is it ok to use a bc860b instead a bc860c

Thx

Branko

[peranders]

Yes.

[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.

[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]

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.

[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.

[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