Do not change the voltage above 18V on the R2 board. The 17.5V for the R2 board is just fine.
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.
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.
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.
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.
Another question from the Fool;
because i've got most of the R values in 1/4W.
Are they useable ?
because i've got most of the R values in 1/4W.
Are they useable ?
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.
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 ?
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 ?
Good that a REAL problem was found.
I think you can use the TIPs but i will look up the spec sheet first.
I think you can use the TIPs but i will look up the spec sheet first.
Thank you Joachim.
Maybe the malfunctioning shunt is responsible for the absence of sound... strangely the shunts output the correct +-24V but maybe there is not enough current.
Maybe the malfunctioning shunt is responsible for the absence of sound... strangely the shunts output the correct +-24V but maybe there is not enough current.
Good that you have found the problem, as the output voltage was 24V this problem should not have any problems (other than sub-optimal regulation). P.s. Be shure to check the driver transistor.
Perfect, I was planning to replace it as well..... Now let´s see if curing the ccs part of the shunt solves the problem.... I wonder..... I miss my scope.
In the mean time I am collecting parts for the R2 🙂
In the mean time I am collecting parts for the R2 🙂
Reading the boom that Hesener sent I have the same values but in the schematic, the values are different.... Is there a final schematic with the correct values for paradise r2 ?
I used the values in post 6296 and got results that i posted. That are my official values.
0.75dB plus in the bass and 0.25dB plus in the treble. That was a deliberate choice by MiiB and me. Getting away the 0.75dB gain at 20Hz is easy. Just make the 73.5kOhm resistor a bit smaller.
0.75dB plus in the bass and 0.25dB plus in the treble. That was a deliberate choice by MiiB and me. Getting away the 0.75dB gain at 20Hz is easy. Just make the 73.5kOhm resistor a bit smaller.
No problem, this is a complex project and got even me confused at times. The R2 on the other hand is a very good stage where all contributors can be proud of.