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Keantoken's CFP cap multiplier
Keantoken's CFP cap multiplier
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Old 16th June 2015, 08:00 PM   #871
RCruz is offline RCruz  Switzerland
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Keantoken's CFP cap multiplier
I do like Oscons, principally on analog amps
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Old 18th June 2015, 04:51 PM   #872
PinkPanther-2 is offline PinkPanther-2  Bulgaria
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Thank you for your answers.
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Old 18th June 2015, 10:33 PM   #873
alexkosha is offline alexkosha  United States
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Keantoken's CFP cap multiplier
Did anyone try Panasonic FRs in KMs or in general raw DC PSUs? I used then in my 2 analog build and they sound nice, however I did not compare them to anything else in the same builds..


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Old 30th June 2015, 07:53 AM   #874
triode_al is offline triode_al  Netherlands
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I got the excellent Dirty boards. Allow stuffing and resting.

When I stuffed one board, I omitted the R1 47 (or 100 ohms) resistor: still it worked well, but of course not as low a output impedance as with 15 ma extra though the BC337.

The config without a R1 is the same as I have in my LeMonstre power amplifiers...

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Old 20th September 2015, 10:58 AM   #875
rensli is offline rensli  Estonia
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I have build another one(positive), with random 1N4148 diodes, 1000uF 200mR caps, Q1 BC337-40 PH59 and Q2 FairChild BD-140-16.

Everything is stock(default dummy load ~25mA):

across 3 1N4148 i get 1.7V drop
When working with 29.80V input, across R2(1K) i get 38mV drop.
Output - input voltage differential : 2.04V(takes a ~minute to settle down)

Applieng 160mA load to the output increases voltage drop on R2 to 43mV.

Is everything working correctly ? Going to adapt them soon in preamp psu circuits

Last edited by rensli; 20th September 2015 at 11:06 AM.
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Old 20th September 2015, 12:21 PM   #876
keantoken is offline keantoken  United States
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Sounds good so far. It passes all the tests except the test that's left, which is how well it blocks input noise. This might be a problem with the BD140.

If you don't mind, please post the following measurements.

1: Get your most sensitive voltmeter (mV accuracy at least) and set it to ACV. Twist the probes together and put the negative probe at the ground pin of C1. Put the positive probe on the negative probe, wait for the measurement to settle and record the value.

2: Put the positive probe at the input of the KM and measure the ACV.

3: Put the positive probe on the output of the KM and measure the ACV.
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Old 20th September 2015, 01:49 PM   #877
rensli is offline rensli  Estonia
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I made some measurements. All info is on the photos.
  1. First two pics are comparison between BD140-16 and BD138G builds.
  2. Rest of the pics are taken on AC mV range set to manual.
  • DC measurements are accurate..
  • AC measurements are questionable or not, you decide please.
Forgot to add: AC mV measurements are taken with BD140-16 % BC337-40. There is little or no difference at all @ noise compared to BD138G % BC549C.
Attached Images
File Type: jpg A BD138G.jpg (234.2 KB, 444 views)
File Type: jpg A BD140-16.jpg (326.4 KB, 434 views)
File Type: jpg KM INPUT 29.9V.jpg (319.4 KB, 380 views)
File Type: jpg KM output 27.8V.jpg (292.3 KB, 342 views)
File Type: jpg KM input 25V.jpg (356.8 KB, 332 views)
File Type: jpg KM output 23V.jpg (315.7 KB, 46 views)
File Type: jpg POWERED ON AC.jpg (298.9 KB, 46 views)
File Type: jpg NO POWER AC.jpg (292.9 KB, 53 views)
File Type: jpg PCB.jpg (549.6 KB, 70 views)

Last edited by rensli; 20th September 2015 at 01:55 PM.
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Old 20th September 2015, 02:10 PM   #878
keantoken is offline keantoken  United States
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The AC voltage with both probes shorted to ground should be nearly the same whether or not the PSU is on. It should be almost nothing. With this inconsistency I can't trust those measurements.
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Old 20th September 2015, 02:30 PM   #879
rensli is offline rensli  Estonia
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Yep, i re-checked PSU on or OFF, tried LM317 based PSU, same results(ACmV increasing when PSU turned on)

Ignore those measurements please.

While comparing BD140 and BD138G, i will go with the first BD140 builds.

First i will try them before the current regulator from apexaudio. Then i will test after the LM317AT & LM337AT psu right at preamp PSU pins.
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Old 26th October 2015, 12:13 AM   #880
marsupialx is offline marsupialx  United States
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It's probably in the thread, but what is the best substitute for 2SA1930 / 2SC5171. (Or a source for genuine 2SA1930 / 2SC5171). Thank you!!!
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