Roender's FC-100 prototype and builder's thread - Page 65 - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State

Solid State Talk all about solid state amplification.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 2nd January 2013, 04:56 PM   #641
lucylu is offline lucylu  England
diyAudio Member
 
Join Date: Jun 2008
Location: England
Hi One of my emitter resistors is very loose in its ceramic white case will this cause problems cheers john
  Reply With Quote
Old 2nd January 2013, 06:28 PM   #642
RKH is offline RKH  United States
diyAudio Member
 
Join Date: Sep 2002
Location: Colorado, USA
Default 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
__________________
Lighten up while you still can ...
  Reply With Quote
Old 13th January 2013, 10:43 PM   #643
diyAudio Member
 
Rudi_Ratlos's Avatar
 
Join Date: Jun 2009
Location: Hamburg / Germany
I have finally finished the layout of the "supplementary audio PCB" and have ordered a prototype PCB:

Click the image to open in full size.

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.
Attached Images
File Type: png Image3.png (77.3 KB, 402 views)
  Reply With Quote
Old 14th January 2013, 05:20 AM   #644
diyAudio Member
 
Join Date: May 2011
Rudi, when the time has come, I will be in.That's something I need

Claus
  Reply With Quote
Old 14th January 2013, 06:22 AM   #645
mj777 is offline mj777  Philippines
diyAudio Member
 
Join Date: Dec 2010
Location: dubai
nice work Sir Rudi, count me in if you offer this pcb in the group buy.

regards,
mj777
  Reply With Quote
Old 18th January 2013, 10:45 AM   #646
miepa is offline miepa  Austria
diyAudio Member
 
Join Date: Aug 2012
hi there,
i`m interested what exact type of resistor you guys use to built the FC-100 ?

did you all go with the - Yageo Metal Film Resistors (Professional) Type MF0 Series ??
thank you.
  Reply With Quote
Old 18th January 2013, 11:00 AM   #647
atupi is offline atupi  Romania
diyAudio Member
 
Join Date: Oct 2010
Location: Bucharest
Good question Miepa as i'm preparing to order some parts for my MP-100.
  Reply With Quote
Old 18th January 2013, 11:41 AM   #648
Telstar is offline Telstar  Italy
diyAudio Member
 
Join Date: Dec 2007
Location: Italy
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.
__________________
"The total harmonic distortion is not a measure of the degree of distastefulness to the listener and it is recommended that its use should be discontinued." D. Masa, 1938
  Reply With Quote
Old 18th January 2013, 12:48 PM   #649
roender is offline roender  Romania
diyAudio Member
 
roender's Avatar
 
Join Date: Sep 2006
Quote:
Originally Posted by Telstar View Post
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.
Anything between 2 and 3 ohm will be ok.
  Reply With Quote
Old 18th January 2013, 01:43 PM   #650
Telstar is offline Telstar  Italy
diyAudio Member
 
Join Date: Dec 2007
Location: Italy
Quote:
Originally Posted by roender View Post
Anything between 2 and 3 ohm will be ok.
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.
__________________
"The total harmonic distortion is not a measure of the degree of distastefulness to the listener and it is recommended that its use should be discontinued." D. Masa, 1938
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



New To Site? Need Help?

All times are GMT. The time now is 09:55 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright ©1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2