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Old 18th July 2012, 07:32 AM   #6281
FdW is offline FdW  Netherlands
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Originally Posted by Bksabath View Post
Hi Quick one before I get ready for flight to Venice.

Yes got R2 Boards
The noise is hiss, white noise.
There is no hum boards are realy good even with open box and fluereshent tube inches awayor moving things around there is none whatsoever the board design is absolutley brilant.

As Albert say it is strange and I think it's My fault seting up V at tp1 tp2
I have both a 25 25 Trafo and 30 30 trafo with 25 X 1.471 and diodedrops I got around 35 + - going in to the boards.

Once again I can change the V at the TP1 and TP2 (+17.5 - 17.5 at present) with the 2 k pots WHAT shuld it be set at please?

I am going to try to take it up to + - 25 at TP1 TP2



On regards to ofset I got 1.36 mV I tried the mod and it fit nice and easy on botom of boards.
It can be set to nothink and desapear with small loading resistor.
I like the space and the 2 set of pads round the imput pins Ideal for small caps and load resistor as needed by MC
Do not change the voltage above 18V on the R2 board. The 17.5V for the R2 board is just fine.
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Old 18th July 2012, 07:34 AM   #6282
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Originally Posted by FdW View Post
The 5.1V will work, but given the high input voltage I would prefer something higher. The 5.1V is the minimum value to be used; it just allows the CCS to work properly. The voltage at TP202 should be the same as at TP203 minus Vbe(Q202). The next thing to do is check the value of R203 and replace Q201 and Q202.
Thank you Frans... I will work on that tonight
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Old 18th July 2012, 07:42 AM   #6283
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Tanks Frans
will live as is then and re visit suply some what quiter with small 100NF on soket from umbilical.

Well I am off now see you next week.

Live well and prosper.
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Old 18th July 2012, 12:34 PM   #6284
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My R2 is very low in hiss, even lower then R1, so i can not explain the problem with hiss that Bksabath has.
Thanks Hesener, to include the offset cancelation. This may not normally be needed, only with higher impedance cartridges and for the total perfectionist.
It works like Bksabath found and good to have it.
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Old 18th July 2012, 12:56 PM   #6285
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Another question from the Fool;
because i've got most of the R values in 1/4W.
Are they useable ?
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Old 18th July 2012, 01:04 PM   #6286
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Yes, but not the bigger resistors that program the current sources ( 10 Ohm ) and the ones that supply in input stage ( 120 Ohm ). Those have to be 2W minimum. I use Metal Oxide from Reichelt, other like Frans prefer Metal Film because of lower voltage coefficient, hence lower noise. It does not make an audible difference though. The impedances are just too low.
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Old 18th July 2012, 01:15 PM   #6287
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This is fine to me.
Because i've already bought the bigger ones @ "B".
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Old 19th July 2012, 12:33 PM   #6288
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Hi Frans

I found TIP31C is shorted... I allready ordered a spare

Regarding the new paradise, Can I use TIP31 (NPN) and TIP32(PNP) instead of D44H11 and D45H11 ?
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Old 19th July 2012, 01:17 PM   #6289
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Good that a REAL problem was found.
I think you can use the TIPs but i will look up the spec sheet first.
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Old 19th July 2012, 01:19 PM   #6290
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They are a bit weaker then the DHs but standing 3A collector is more then enough.
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