2SK170 BL MC step up amp - diyAudio
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Old 10th May 2011, 05:20 AM   #1
batty is offline batty  Australia
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Default 2SK170 BL MC step up amp

I have some 2SK170bl lying around and want to make an amp for my Denon DL103 to go into the MM input on my Copland. I have an SUT but wanted to try SS. I'm looking for a simple circuit that has the option of gain switching to allow for lower output MCs further down my MC road.

Anyone know of a cct diag, preverably running off a 9v supply.

No RIAA eq needed.
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Old 10th May 2011, 07:42 AM   #2
Salas is online now Salas  Greece
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This one fits most spec you described except for gain switching.
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Old 10th May 2011, 07:54 AM   #3
h_a is offline h_a  Europe
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The Ono front end comes to mind; pretty similar to Salas' version but with a cap multiplier to remove PSU-noise. The LM-regulators however should do pretty well also.

Hannes
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Old 10th May 2011, 08:00 AM   #4
Salas is online now Salas  Greece
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*The above circuit has a cap multiplier after the 7809 also.
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Old 10th May 2011, 08:10 AM   #5
batty is offline batty  Australia
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Thanks guys.

Is the o/p taken from junction of C3/R5? and could I use a PP3 battery with +ve connected where the bottom of R1 joins?

Cheers

Steve
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Last edited by batty; 10th May 2011 at 08:13 AM.
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Old 10th May 2011, 08:42 AM   #6
Salas is online now Salas  Greece
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O/P at C3,R5 node. R1 is the load resistor, +Ve goes on top of it. Keep whatever is there after the 7809 or at least put 100R in series from PP3's + to R1's top and keep C2. 430 Ohm R2 loading good for DL103. Will drain 14mA per channel, not too long a listen with a PP3...
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Old 10th May 2011, 09:34 AM   #7
batty is offline batty  Australia
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OK thanks Salas, probably a 12vdc adaptor to feed the 7809s unless I can find a 15v version.

I am thinking of building inside the same box as the SUT just for ease of build and swapping cables over. all for fun you understand.

What type of caps
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Last edited by batty; 10th May 2011 at 09:41 AM. Reason: fat fingers
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Old 10th May 2011, 10:27 AM   #8
Salas is online now Salas  Greece
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12VDC adaptor far away to avoid fields still OK. Panasonic FC electrolytics or alike low ESR for the 1000uF ones and PP or Teflon (best) for the 0.47uF Cout. The C4,5 0.1uF for 7809 termination can be MKT.
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Old 10th May 2011, 11:00 AM   #9
gpapag is offline gpapag  Greece
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There:
PSU RC multistage filtering

Tony suggests having a minimum of 5Vdc difference between input-output on LM 317.

It is my observation in praxis that this holds true for fixed voltage 3 leg regulators as well. It garantees specified regulation action from the chip.

This 5V difference is hidden in many of the performance curves supplied by the manufacturers of the voltage regulators.

Salas thanks for providing this schematic.

Regards
George
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Old 10th May 2011, 11:15 AM   #10
batty is offline batty  Australia
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what would the max input be for a 7809, would 18V be to much to drop to 9v.
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