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Keantoken's CFP cap multiplier
Keantoken's CFP cap multiplier
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Old 25th April 2020, 06:23 PM   #1151
prasi is offline prasi  India
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Keantoken's CFP cap multiplier
thanks keen,
tried with a 500 ohm load, still same thing. grounding arrangement can be seen in the below image.
clean ground (317/337 and CMX share a common ground point near the leds.
rectifier and bulk caps are far upstream.

I will try replacing the 337/327 and see..
my load demand is quite low, ESP HPA. In that case will mje15033/32 pair be ok?
regards
prasi
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Old 25th April 2020, 06:36 PM   #1152
keantoken is offline keantoken  United States
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That layout looks okay. I notice I didn't recommend the 15033/32 for the Kmultipliers. That is likely because I didn't have any to test, or if I did, they were not stable.

I would suggest finding a way to load the kmultipliers over 25mA, or switching to D44/45H11G. You can also try switching to BC5xxC for the TO92s, that has also worked before.

Just to make sure it is not another problem, please give me the voltage at each transistor pin.
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Old 25th April 2020, 06:58 PM   #1153
keantoken is offline keantoken  United States
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For everyone else: I do have Kmultiplier boards, but I got them from the fab without being cut apart, and I can't find my shears. Until I do, you'll have to get 4 at a time and cut them apart yourself.
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Old 25th April 2020, 09:09 PM   #1154
prasi is offline prasi  India
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Keantoken's CFP cap multiplier
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Originally Posted by keantoken View Post
That layout looks okay. I notice I didn't recommend the 15033/32 for the Kmultipliers. That is likely because I didn't have any to test, or if I did, they were not stable.

I would suggest finding a way to load the kmultipliers over 25mA, or switching to D44/45H11G. You can also try switching to BC5xxC for the TO92s, that has also worked before.

Just to make sure it is not another problem, please give me the voltage at each transistor pin.
Thanks kean, I will put them to good use in next project with recommended transistors ( an AKSA class A HPA) . meanwhile for this esp hpa , i built up a simple crc+lm317/337 as per Power Supply for Preamps , works fine for the purpose.

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prasi
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Old 1st July 2020, 02:03 AM   #1155
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Hi Keantoken, i want to use some sot223 transistor for space saving so can i use bcp53/56, pzta06/pzta56 in place of big transistor?
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Old 1st July 2020, 03:06 PM   #1156
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As long as the transistor can support the power dissipated, it is worth a try. If the transistor is not suitable you will have low PSRR or it may oscillate.
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