Roender's FC-100 Rev.1 Group-Buy - Page 3

zsaudio · 19th March 2012, 07:36 AM

thanks Rudi

zsaudio · 19th March 2012, 08:19 AM

Hello Rudi,

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

Best Regards,
zsaudio

vitalica · 19th March 2012, 01:08 PM

Count me in for :

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

Thanks!

Rudi_Ratlos · 19th March 2012, 01:13 PM

Find enclosed the current order list.

Vitalica: I will add the emitter-resistors.

Best regards - Rudi_Ratlos

Rudi_Ratlos · 20th March 2012, 10:46 AM

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

Cambe · 20th March 2012, 02:11 PM

Hello Rudi,
So,are you still going to offer the "Transistor-Matching-PCB"?

Rudi_Ratlos · 20th March 2012, 03:31 PM

@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

Cambe · 04:02 PM

@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

RKH · 21st March 2012, 05:08 AM

Hi Rudi,
Please ...
4 Amp PCBs
4 Shunt PCBs
4 resistor kits
2 soft starts

Thanks very much.

Ryan

touchdown · 21st March 2012, 07:09 AM

Hello Rudi,

please count me in for n°2 Amp PCBs and n°2 resistor kits.

Outstanding work, thanks!
Nicola/touchdown

20th March 2012, 03:56 PM	#28
Cambe diyAudio Member Join Date: Aug 2001 Location: USA,NorthCarolina	@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

21st March 2012, 05:08 AM	#29
RKH diyAudio Member Join Date: Sep 2002 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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19th March 2012, 07:36 AM	#21
zsaudio diyAudio Member Join Date: Jun 2005 Location: Hungary	thanks Rudi

19th March 2012, 08:19 AM	#22
zsaudio diyAudio Member Join Date: Jun 2005 Location: Hungary	Hello Rudi, could you add my name under a stereo set of mpc resistors please? Thanks a lot Best Regards, zsaudio

19th March 2012, 01:08 PM	#23
vitalica diyAudio Member Join Date: Feb 2005	Count me in for : - 4 amp boards - 4 sets of Futaba 0.1R resistors - 10 shunt psu boards Thanks!

20th March 2012, 02:11 PM	#26
Cambe diyAudio Member Join Date: Aug 2001 Location: USA,NorthCarolina	Hello Rudi, So,are you still going to offer the "Transistor-Matching-PCB"?

21st March 2012, 07:09 AM	#30
touchdown diyAudio Member Join Date: Mar 2006 Location: Vicenza	Hello Rudi, please count me in for n°2 Amp PCBs and n°2 resistor kits. Outstanding work, thanks! Nicola/touchdown