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

[Rudi_Ratlos]

Adrian,

the schematics as shown in the Builder's Manual is the current one.

I have prepared shopping carts from the German distributor REICHELT.
I will send the carts' URLs to you via EMail in a minute.

Please use 0R1 emitter resistors.

Best regards - Rudi_Ratlos

 

[atupi]

Any chance to have the schematic with better resolution? Sometimes is hard to read values of different components on the manual schematic.
Thanks and happy DIY in the new year !

 

[Rudi_Ratlos]

Adrian: I have attached the FC-100 schematics used as an ADOBE PDF-file.

Best regards - Rudi

 

[atupi]

Super ! Thanks!

 

[miepa]

what exact type of resistor did you guys use for the FC100 ?

did you all go with the Yageo Metal Film Resistors (Professional) Type MF0 Series ??

 

[Rudi_Ratlos]

Michael, wrong thread! I generally use YAGEO Metall film resistors.

Rudi

 

[Telstar]

what exact type of resistor did you guys use for the FC100 ?

did you all go with the Yageo Metal Film Resistors (Professional) Type MF0 Series ??

I never heard them (I mean the name).
What would be their advantage vs excellent resistors such as Dale (with attention on series), Holco and PRP (of which I have seen distortion measurements and several positive opinions)?

 

[miepa]

I never heard them (I mean the name).
What would be their advantage vs excellent resistors such as Dale (with attention on series), Holco and PRP (of which I have seen distortion measurements and several positive opinions)?

first problem is, that i cant find all values with PRP / Dale / Holco which are needed.
second is, PRP has a to big footprint with 0.5W

 

[Telstar]

first problem is, that i cant find all values with PRP / Dale / Holco which are needed.
second is, PRP has a to big footprint with 0.5W

I haven't ordered anything for my FC100 yet, but it seems strange since Vishay/Dale has the most complete range, maybe they werent available at the time.

Speaking of resistors, in your opinion there is any possible issue using parts with looser degradation over time PPM >=100?
For a different project I have used some RN55E which are of such type, while being still a 1%.

 

[miepa]

I haven't ordered anything for my FC100 yet, but it seems strange since Vishay/Dale has the most complete range, maybe they werent available at the time.

Speaking of resistors, in your opinion there is any possible issue using parts with looser degradation over time PPM >=100?
For a different project I have used some RN55E which are of such type, while being still a 1%.

jep. i can`t find a 2R2 Dale at any distribution i know
and RN55 is way to small it has to be 0.5W that would mean RN65 - but then you have the wrong footprint.
so its not that easy as it seems!

 

[Telstar]

jep. i can`t find a 2R2 Dale at any distribution i know
and RN55 is way to small it has to be 0.5W that would mean RN65 - but then you have the wrong footprint.
so its not that easy as it seems!

My RN55 was 1/8W for a headphone amp, just an example of high PPM cheaper type.

dale resistor Metal Film Resistors - Through Hole | Mouser

Weird, you're right.

Using higher wattage perhaps? "Vertical mount" don't look so horrible sometimes.
anyway i dont believe a couple of different resistors will do much to the sound. We are really nitpicking here.

 

[Rudi_Ratlos]

Please, Michael and Guido: use the FC-100 Builder's thread for questions like: which brand of resistors to use.

http://www.diyaudio.com/forums/solid-state/202047-roenders-fc-100-prototype-builders-thread.html

Best regards - Rudi

 

[miepa]

sorry Rudi.
for sure i will do so!

 

[Telstar]

Oh I'm sorry, I thought it was the builder's thread.

ask a mod to move our posts maybe?

 

[Rudi_Ratlos]

Gentlemen, dear FC-100 friends,

my DIY-friend METAL and I are currently working on a "universal - passive PRE-AMP supplementary PCB", consisting of:

- Source Selection (3 optional choices)
- Mute functionallity
- George Stantscheff's "Lightspeed Attenuator" being controlled by a motorized potentiometer, being controlled by Infrared
- 2 Temperature Sensors
- 2 x 16 chars Front-Panel - LCD - Display


http://www.abload.de/img/image1tfa8s.png

Everything can be operated from a infrared-control unit.
It won't be long until we will finally be able to offer you this PCB.

If anyone of you is interested to have this PCB: please tell me.

Best regards - Rudi_Ratlos

 

[Rudi_Ratlos]

I already did the prototype PCB (the small red 100x100m PCB in the middle), and everything "works as designed".

Best regards - Rudi_Ratlos

 

[pinnocchio]

The only issue I see is sourcing matched LDRs. Would someone be supplying matched sets? If yes then this is really interesting to me.

Will you sell just PCB or LCD and motorized pot as well? Will it have IR learning features? What would be the cost?

Sorry for all the questions.

Ciao!
Do

 

[Rudi_Ratlos]

Yes, of course, Pinnocchio:

I will provide you the PCB, a pre-programmed PIC 16F886 µProcessor and matched LDRs. That is it.
I have ordered a couple (16 pcs., still waiting for RSOnline's receipt) of LDRs for my own use, and I will find out, how well they will match.
George Stantscheff told me how to match them.

Best regards - Rudi_Ratlos

 

[RKH]

Yes... interested

Hi Rudi,
I am interested in the pre-amp project.

Cheers,
Ryan

 

[pinnocchio]

I'm in!

Do