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Old 29th March 2012, 05:08 PM   #81
zsaudio is offline zsaudio  Europe
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What a cute BOM with zoomable pictures.
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Old 30th March 2012, 09:51 PM   #82
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Location: Columbus, Ohio
Default Join the Group Buy

I would like to be included in the FC-100 Group Buy as follows:

- 4 FC-100 PCBs
- 4 Shunt-PCBs
- 4 LSProtect PCBs
- 4 SoftPowerOn PCB

Take care but I still would like to obtain SYMASYM since I love to
build power amplifiers of all kinds.
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Old 30th March 2012, 10:19 PM   #83
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MrSavage,

do you really need 4 Soft-Power-On - PCBs?

You can connect 3 transformers ( 2 transformers 2 x 25 VAC for the backends, 1 transformer for the frontend) to one Soft-Power-On PCB!
And: don't you need the FUTABA MPC75 0R1 emitter resistors?

Find enclosed the modified order.
You can use PAYPAL to transfer the total sum incl. PAYPAL tax to: RRozek@t-online.de
The prices are in € (EURO).

Best regards - Rudi_Ratlos

P.S. I hope that your letter does not exceed the weight of 500gr.
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Last edited by Rudi_Ratlos; 30th March 2012 at 10:22 PM.
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Old 31st March 2012, 10:13 AM   #84
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MrSavage,

this is the way the FC-100 is meant to be set up in a typical stereo - configuration:

Click the image to open in full size.

http://www.abload.de/img/stereo-configt5bx6.png

The 220/125VAC mains connect to the "Soft-Power-On - PCB".
This PCB has a small transformer on board, and it is this little transformer that you switch on.
The Soft-Power-On - PCB delimits the mains' current to about 4A during the time, the inrush-current flows
(0.7 secs, determined by the timer's external components).

The 3 transformers used to operate the FC-100 in this typical setup (2 transformers with 2 x 25 VAC each for the backends,
1 transformer 4 x 34 VAC to for the frontends) connect to the PCB-connector of this PCB.

The FC-100 PCBs have the backend-PSU on-board; the two 2x25VAC transformers connect to the onboard-PSUs.

The secondaries of the 4 x 34VAC transformer connect to 2 shunt-regulators, providing a very stable +/-39VDC voltage at 21.5mA
to the frontends of the AMP's PCBs.

The speakers' outputs connect to the "Speaker-Protection-PCBs" that protect your speakers from a malfunction of the AMP.

So: in a typical setup of the FC-100 you need:

- 2 transformers, 2 x 25 VAC
- 1 transformer, 4 x 34 VAC
- 1 Soft-Power-On PCB
- 2 FC-100 PCBs
- 2 Shunt-regulator PCBs
- 2 Speaker Protection PCBs

Best regards - Rudi_Ratlos
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Last edited by Rudi_Ratlos; 31st March 2012 at 10:35 AM.
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Old 31st March 2012, 03:39 PM   #85
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Hi Rudi,
I have decided to also take 2 - LS Protect PCB's and 2 - Soft-power on PCB's. So, I owe you 78 euros total Correct? Will send you the funds today.
I have two of these transformers:GB For RMI-FC100 Parts
Post # 107.

So, I need another 2 x 34V transformer correct?

Last edited by Cambe; 31st March 2012 at 03:54 PM. Reason: post #
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Old 31st March 2012, 10:01 PM   #86
RKH is offline RKH  United States
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Default Shunt Regulator transformer

How much wiggle room is there on the VAC output of the shunt regulator power supply transformer?

Is 35VAC too high? Is 33VAC too low? Is it just a matter of dissipating more heat in the regulator itself (if VAC is too high)? I ask because 35VAC output transformers are more easily found, at least in the US, than 34 VAC transformers.

Thanks,
Ryan
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Old 1st April 2012, 08:01 AM   #87
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@Cambe, the total price is 85.

@Ryan: I am currently operating the frontend-shunt from a 35VAC transformer. ZSAUDIO uses a 30VAC transformer, if I remember this correctly.

Mihai designed the shunt with an output of +/-39VDC rated at 21.5mA (!) to the frontend.
Please keep in mind that a standard 36V zener-diode has a deviation of 10%, that mains fluctuate, that the transformer's output changes according to the load, ...

In my eyes any transformer giving between 32 - 35 VAC will do it.

Best regards - Rudi_Ratlos
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Old 1st April 2012, 08:23 AM   #88
zsaudio is offline zsaudio  Europe
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You can go for the 35 Vac trafo.

I use 39 Vac right now and i only have rised temp on the heatsinks which passed my finger test. The amp has no problem running long time.
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Old 1st April 2012, 05:55 PM   #89
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Hi Rudi,
Payment sent.
Thanks
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Old 1st April 2012, 08:48 PM   #90
PeterH is offline PeterH  Germany
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Hello Rudi,
please count me in for

4 FC100 PCB
2 shunt PCB
2 LS Protect
2 soft power on

Thank you!

Peter
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