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

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Rudi_Ratlos

Rudi_Ratlos

Member
Joined 2009
Yesterday night I have "married" the prototype of the new "multi-purpose Lightspeed-Attenuation board" with an old, discarded SYMASYM
of mine (see image attached).
Everything works as designed, I do not preceive any hum, every functionality can be controlled by an infrared - control unit, ...
(look at post #520)

I have ordered 10 of the PCBs and will build them with some of my German DIY friends, before I will offer this PCB to the community.
But: be sure - this small PCB is a real gem and an adeqaute mate for your FC-100.

Best regards - Rudi_Ratlos
 

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Rudi_Ratlos

Rudi_Ratlos

Member
Joined 2009
Adrian, I have already received a dozen of professionally etched PCBs and am currently busy packing the components that I offered
in the 1st round (see my post #522) into boxes.

The groupbuy includes:

- the PCB
- 2 matched pairs of LDRs
- a BOURNS 100K motorized potentiometer
- a small transformer 7.5VAC / 4.5VA
- a pre-programmed PIC 16F886 µProcessor and a 28-pole socket

I have built a test-rig and measured the value of the photocell-resistor of a LDR at 10 different levels of current flowing through the LED.
Since I have ordered a big quantity of LDRs, I am able to offer well-matched LDR pairs to everybody who participated in the 1st round.

I have currently 2 sets left. You can have one, if you like.
Find attached the matching result of the LDRs belonging to one of these spare sets.
Colums B-K show the resistance of the photocell while the LED is connected to a 5V power supply through resistor B1-K1.

I have already written a Builder's Manual (in German Language).

The BoM (not including the LCD-display) can be found here:
https://secure.reichelt.de/index.html?;ACTION=20;AWKID=719405;PROVID=2084

The price for a set is 53.45€. Worldwide shipping is included.

Best regards - Rudi_Ratlos
 

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Rudi_Ratlos

Rudi_Ratlos

Member
Joined 2009
The 1st German DIYer completed my "General Purpose Lightspeed Attenuator" - PCB, connected it to his amplifier and
is very, very content with the result.
I will wait for the feedback of some other DIYers.

Best regards - Rudi_Ratlos

P.S. He did not yet connect the temperature sensors; he will do this this afternoon.
 

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A

atupi

Member
Joined 2010
Hi Rudi,

just finished building the attenuator. Not tested yet soundwise and i think i need to wait until monday maybe for this but so far everything works fine.
I've noticed the motorized potentiometer is having some large imbalance between L and R total resistence and also imbalance in intermediate positions of whiper. (95k&87k total resistence each channel)
I would be interested if you or someone else measured the potentiometre values in different positions.
I was asking myself during build why Mr Stancheff did't installed two potentiometres for shunt LDR's also, there is a reason ?

Thanks a lot Rudi for this nice kit !

Adrian

An externally hosted image should be here but it was not working when we last tested it.

An externally hosted image should be here but it was not working when we last tested it.
 
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Rudi_Ratlos

Rudi_Ratlos

Member
Joined 2009
Gentlemen, from time to time I receive a request concerning the availability of FC100 - PCBs (AMP and Shunt).
Currently I do not have any PCBs left, but I will order a small couple of PCBs in the near future - if you like!
I will not provide you any components (like transistors, capacitors, ...) this time.

The price will be 12€ for the AMP-PCB and 10€ for the Shunt-PCB.
Shipping is 3.45€ worldwide.

I will wait with ordering the PCBs until the minimum amount of PCBs to be etched (10) has been reached.

Best regards - Rudi_Ratlos
 

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lucylu

Member
Joined 2008
Rudi_Ratlos said:
Gentlemen, from time to time I receive a request concerning the availability of FC100 - PCBs (AMP and Shunt).
Currently I do not have any PCBs left, but I will order a small couple of PCBs in the near future - if you like!
I will not provide you any components (like transistors, capacitors, ...) this time.

The price will be 12€ for the AMP-PCB and 10€ for the Shunt-PCB.
Shipping is 3.45€ worldwide.

I will wait with ordering the PCBs until the minimum amount of PCBs to be etched (10) has been reached.

Best regards - Rudi_Ratlos
Click to expand...
Bump regards john
 
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