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Keantoken's CFP cap multiplier
Keantoken's CFP cap multiplier
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Old 23rd May 2018, 01:24 PM   #1131
sianturi is offline sianturi  Indonesia
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Originally Posted by sianturi View Post
Hello Keantoken,

2SA1930/2SC5171 have been discontinued. Mouser doesn't stock them anymore

OTOH, the discontinuation notice from Toshiba states that the replacement for these are TTA004B/TTC004B, respectively. Can we use this?
It works! TTA004B & TTC004B. OTOH, i don't know how to measure the ripple with my oscilloscope....
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Old 23rd May 2018, 02:48 PM   #1132
RCruz is offline RCruz  Switzerland
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Keantoken's CFP cap multiplier
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Originally Posted by sianturi View Post
It works! TTA004B & TTC004B. OTOH, i don't know how to measure the ripple with my oscilloscope....
Good
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Old 23rd May 2018, 11:12 PM   #1133
sianturi is offline sianturi  Indonesia
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K-Multiplier + Salas Shunt Regulator V1.2R

I finally managed to measure peak-to-peak and Vrms ripple, but not at the K-Multiplier output....
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Old 23rd May 2018, 11:27 PM   #1134
keantoken is offline keantoken  United States
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Originally Posted by DNi View Post
Now, I know that several Members built this circuit with red LEDs and reported correct results, but I still don't know why it was different in my case.

Regards,
Braca
The version on my webpage uses 3 diodes instead of an LED, it is a bit old. Since the current boards use an LED, they seem to have a bit more voltage drop. You could replace the LED with 3 1N4148 in series, although the IR LED is apparently also a solution.
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Old 24th May 2018, 11:12 AM   #1135
DNi is offline DNi  Switzerland
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I'm about to build another two K-Multipliers, and have now a few more IR LEDs at my disposal, so the table from post #1130 will probably get an update.
However, in my experiments with the PCB offered by Keanu, only IR LEDs with shorter wavelengths (< 900nm) seem to have been capable of producing the target voltage drop of 1.8V across Q2.


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Braca
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Old 15th July 2018, 06:55 PM   #1136
DNi is offline DNi  Switzerland
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As promised, here are the voltage drop measurements for several LEDs in my K-Multiplier with BC334-40/Toshiba TTC004B (the circuit diagram from this thread, assembled on the Kean's PCB):
Click the image to open in full size.It seems that only the 850nm (wavelength) IR LED produces the desired voltage drop of 1.8V across the pass transistor Q2.
The results for the negative polarity K-Multiplier (BC327-40/Toshiba TTA004B) are virtually the same, so I'm not quoting them.

Regards,
Braca
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