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Old 19th March 2012, 07:36 AM   #21
zsaudio is offline zsaudio  Europe
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thanks Rudi
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Old 19th March 2012, 08:19 AM   #22
zsaudio is offline zsaudio  Europe
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Hello Rudi,

could you add my name under a stereo set of mpc resistors please?
Thanks a lot

Best Regards,
zsaudio
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Old 19th March 2012, 01:08 PM   #23
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Count me in for :

- 4 amp boards
- 4 sets of Futaba 0.1R resistors
- 10 shunt psu boards

Thanks!
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Old 19th March 2012, 01:13 PM   #24
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Find enclosed the current order list.

Vitalica: I will add the emitter-resistors.

Best regards - Rudi_Ratlos
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Old 20th March 2012, 10:46 AM   #25
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I asked OnSemi if it is possible to buy "pre-matched" NJL-transistors directly from them.

This is OnSemi's reply:

...

You need matched pair selection on them, but, unfortunately we (ON Semi) do not supply totally matched devices.
You will need to do this yourself by purchasing a number of devices and match the VBE(on) and the hFE.
Or you will need to contact a local distributor and they may test each part and match the devices for you. Thanks.

Regards,PeterG
ON Semiconductor
Technical Support Center


So it is up to you to match the NJL - output transistors.
A test-jig like this can be built in a minute.

The schematics is following ANATECH's proposal in post #25 / #26 in:

Roender's FC-100 prototype and builder's thread

Another way how to match output devices can be found here:

Matching Power and Driver Transistors

Best regards - Rudi_Ratlos
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File Type: png Match1.png (13.8 KB, 492 views)
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Old 20th March 2012, 02:11 PM   #26
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Hello Rudi,
So,are you still going to offer the "Transistor-Matching-PCB"?
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Old 20th March 2012, 03:31 PM   #27
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@Cambe,

the layout of a small PCB for the matching-circuit above is done in some minutes.

But do you really need it? Build a little test-jig (like the one above) on your own!

Best regards - Rudi_Ratlos
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Old 20th March 2012, 03:56 PM   #28
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@Rudi:
Since you were offering a layout and possible PCB for transistor matching
which, I think is a good idea since matching is a big part of building the amplifier properly. Nice,neat looking layout! Just thought I'd ask about it.
I'd like to be added to your list for:
2 - Amplifier PCB's
2 - Shunt PCB's
4 - Resistors kits

Last edited by Cambe; 20th March 2012 at 04:02 PM. Reason: spelling
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Old 21st March 2012, 05:08 AM   #29
RKH is offline RKH  United States
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Location: Colorado, USA
Hi Rudi,
Please ...
4 Amp PCBs
4 Shunt PCBs
4 resistor kits
2 soft starts

Thanks very much.

Ryan
__________________
Lighten up while you still can ...
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Old 21st March 2012, 07:09 AM   #30
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Hello Rudi,

please count me in for n2 Amp PCBs and n2 resistor kits.

Outstanding work, thanks!
Nicola/touchdown
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