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

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R

RKH

Member
Joined 2002
Similar problem

I had a similar issue with one of my resistors. I suspect that the problem is due to too much heat applied when I soldered it in place. I would replace the resistor. Better safe than sorry.

Also, there is a fine grit that comes out of the loosened resistor. I also recommend you look for that and thoroughly clean the board.

I tend to take a more cautious approach to these things. YMMV.

Ryan
 
Rudi_Ratlos

Rudi_Ratlos

Member
Joined 2009
I have finally finished the layout of the "supplementary audio PCB" and have ordered a prototype PCB:



The size of the PCB is 100 x 100 mm and it includes:

- a 3-source selection (top left)
- a mute relais
- George Stantscheff's Lightspeed Attenuator (top right)
- 2 temperature sensors (LM35) (below the attenuator)
- LCD connectivity
- infrared sensor
- Motor-H - bridge (for motorized potentiometer adjusting the attenuator, on the bottom)

The heart / brain of the PCB is included in a PIC 16F886 µProcessor, and the PCB's functionality is controlled by an infrared remote control unit.

This PCB is of course intended to work together with my FC-100.

I do not yet have much experience with the programming of µProcessors, but I will learn it, and maybe, in a month or so,
I will be able and offer you (if you like) this PCB.

Best regards - Rudi_Ratlos

P.S. John, Ryan: I have never had any problems soldering MPC74 - type - resistors.
 

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T

Telstar

Member
Joined 2007
Ok since this is the builders thead I have a question about those elusive 2.2R resistors.
How much tolerance can the circuit stand without ANY degrade in performance or stability?
I'm asking this because maybe we can find 2.21R or 2.1R from the usual sources.

On a different project I'm working on presently, I changed .47 output resistors with .5 to get them of a better quality.
 
roender

roender

Member
Joined 2006
Telstar said:
Ok since this is the builders thead I have a question about those elusive 2.2R resistors.
How much tolerance can the circuit stand without ANY degrade in performance or stability?
I'm asking this because maybe we can find 2.21R or 2.1R from the usual sources.

On a different project I'm working on presently, I changed .47 output resistors with .5 to get them of a better quality.
Click to expand...

Anything between 2 and 3 ohm will be ok.
 
M

miepa

Member
Joined 2012
Telstar said:
I did another search on Mouser up to 2.5 ohm, and still nothing available. I had to up the power to 1W to find something.
If you can/like mount vertical there are a few that could work.

This is the closest match:
CPF12R2100FKB14 Vishay/Dale | Mouser

Hope this could help u guys.
Click to expand...

hmmm, then you maybe looked in the wrong place!
here you go: cmf552r Metal Film Resistors - Through Hole | Mouser
shows all CMF55 between 2-3Ohm which can be ordered at the moment at mouser!

roender said:
Anything between 2 and 3 ohm will be ok.
Click to expand...

roender, what would be the "better" solution instead of the 2R2?
2 Ohm
or
2,87 Ohm

thank you.
 
A

atupi

Member
Joined 2010
Could someone help me and explain how to use the testing/matching circuit presented on Buiders manual Page 22 in order to measure Hfe and Vbe for:
2SC3423Y/2SA1360Y
MJE15034/MJE15035
NJL0281/0302

For To-92 transistors i have a DMM with hfe measuring capability.

Thanks!
Adrian
 
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