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Old 2nd December 2012, 12:28 PM   #7831
FdW is offline FdW  Netherlands
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Originally Posted by sampler View Post
Ok, here is what my simulator spitted out. Gain is 57dB and good riaa compliance with increased shunting resistor from 130k to 142k. Typical nice SE harmonic distribution for 1Vrms out with H2 dominant. There was missing bias resistor for buffer, added that.
Just to let you(all) know that I like it, here a fitting PSU
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File Type: png Shunt VReg by FdW 35V(CroMagnon).PNG (106.4 KB, 327 views)
File Type: png Shunt VReg by FdW 35V(CroMagnon) Noise.PNG (51.3 KB, 319 views)

Last edited by FdW; 2nd December 2012 at 12:33 PM.
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Old 2nd December 2012, 12:35 PM   #7832
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Just to let you(all) know that I like it, here a fitting PSU
All LED's running at 1.2mA, so it can be used as the light source of the cave
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Old 2nd December 2012, 12:58 PM   #7833
brianco is offline brianco  Ireland
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Old 2nd December 2012, 01:01 PM   #7834
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40 LEDs for stereo, no need to drag a Xmas tree in the house with such a phono stage.
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Old 2nd December 2012, 01:03 PM   #7835
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Thanks Frans. I make a little test circuit today to find out if the input stage works thermally.
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Old 2nd December 2012, 01:11 PM   #7836
RCruz is offline RCruz  Switzerland
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Originally Posted by FdW View Post
Just to let you(all) know that I like it, here a fitting PSU
Hi Frans
How much current can it deliver ?

Would you care to describe the circuit functioning for us in human language ?
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Old 2nd December 2012, 01:36 PM   #7837
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As far as i can tell the shunt part looks similar to the Paradise. The BJT CCS is unusual though.
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Old 2nd December 2012, 01:44 PM   #7838
FdW is offline FdW  Netherlands
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Hi Frans
How much current can it deliver ?

Would you care to describe the circuit functioning for us in human language ?
From the circuit as shown I estimated the 40mA was plenty, the CCS is running at 86mA (and if 40mA is indeed plenty it could be lowered to 60mA). In general I like the CCS at 1.5 to 2 times the current needed by the attached appliance (in this case the CroMagnon). The CCS can be adjusted by changing the 15 Ohm's resistor.

The short description is:
1) Q6/Q7 form a constant voltage source, the reference voltage for this is V(out) + V(D5) + V(D3).
2) Q1/Q3 form a constant current source, the current set is (V(D10) - Vbe(Q3)) / R(Iset1).
3) Mosfet M3 shunts the current from the CCS to ground and it is regulated by Q2 (the load for Q2 is formed by a CCS 2N4393 (about 1mA)).
The output voltage is set by Vbe(Q2) and this is V(P35V) - V(Dstring-of-leds) - (V(R3) + V(Trimmer)) = +- 600mV. There is a 470 Ohm (R5) resistor parallel to this 600mV giving (about) 1.2mA current in the led's.

In general:
When V(P35V) rises the current in R5 rises, Ohm's law states that the voltage across R5 must rise and it cannot, the excess current is dumped in the base of Q2, this starts conducting and that switches the mosfet on, this in turn lowers the output voltage.

And that's all (actualy there is a lot more to it but come to me and we talk about it)
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File Type: png thatsalllogo.png (263.1 KB, 290 views)

Last edited by FdW; 2nd December 2012 at 01:54 PM.
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Old 2nd December 2012, 01:46 PM   #7839
FdW is offline FdW  Netherlands
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And then there is C6/R7 (as was adviced by the ATL-lab guys)

The CVS is an emitter follower where the CCS is inserted as a 'kind of' degeneration 'device'.

Last edited by FdW; 2nd December 2012 at 01:58 PM.
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Old 2nd December 2012, 01:50 PM   #7840
FdW is offline FdW  Netherlands
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