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gtose 1st January 2020 05:32 PM

As an aside, EEVblog has this episode explaining the basics of cap multipliers that I found interesting and educational: YouTube.

Prasi, the new layout looks great. Looking forward to what you come up with in 2020. Happy new year all!


prasi 2nd January 2020 02:18 PM

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Thank you guys for the suggestions ...
here is the modified version. extreme corner holes removed and size maintained.

to-264 is about 5 mm thick. so one can use 5-7 mm stand offs for the inside mounting holes and for the other extreme edge , one can do one of the following...
1. Slide the TO-264 as far back as possible to use some existing mounting hole. let the extreme edge of pcb rest on some part of the TO-264. (use 5mm stand-off in this case)
2. use the TO-264 mounting hole to bolt pcb to bottom plate / heat sink. (use 7 mm stand-off for holes and 1-2 mm washer between bjt and pcb bottom).. We are soldering THT components , so we have to keep sufficient clearance between BJT top surface and bottom of pcb.

Hope its clear.....:D
I will try to make some 3d models and post here...

Luke 2nd January 2020 07:21 PM

this one is the best I think. Whats a good pass transistor to use here? Does speed matter or just gain?

prasi 4th January 2020 06:50 AM

9 Attachment(s)
Here are some 3-D pics to given an idea of mounting as per the 2 options I had posted above..
Also posted are the gerbers, sch and stuffing guide..

prasi 4th January 2020 07:51 PM


Originally Posted by Luke (
Whats a good pass transistor to use here? Does speed matter or just gain?

One could use highest gain devices , as gain is most important.

e_fortier 4th January 2020 08:22 PM

Very nice work Prasi.

Will the PCB be easy to separate in 2 sections?


Luke 4th January 2020 08:35 PM

Hi Prasi, are you going to do a group buy for these? If you are I would be interested.

prasi 5th January 2020 03:12 AM

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Hello Eric,
Yes, I have provided a separate gerber file containing 'v-score' layer in the middle in the attached gebers here.

Hello Luke,
I could do a GB if there is more interest (20-30 nos.), pcbs would be in 2.4mm thickness and 70um copper. So here is list
prasi-2 nos.
jameshillj-4 nos.
Luke-2 nos.

Otherwise I can order a batch of 10 pcbs from China and send you couple. Lets wait a day or two to see.


e_fortier 6th January 2020 04:19 AM

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Hi Prasi

I received a quote from PCBway, instead of the regular $5 (up to 10 regular size 100mm x 100mm max.) I received the following $44 quote.

Seems that it’s more work for them.


vgeorge 6th January 2020 06:50 AM

You could try PCB Prototype & PCB Fabrication Manufacturer - JLCPCB and see if you get a lower quote.

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