Switchable Hi-Z input impedance, how ? - Page 25 - diyAudio
Go Back   Home > Forums > Live Sound > Instruments and Amps

Instruments and Amps Everything that makes music, Especially including instrument amps.

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 31st July 2012, 08:07 PM   #241
tinitus is offline tinitus  Europe
diyAudio Moderator R.I.P.
 
Join Date: Nov 2005
for a start, just to get an idea of how this switch works
so far only half of it used
and not yet right either
Attached Images
File Type: png bass pre layout 10xx.png (82.4 KB, 17 views)
  Reply With Quote
Old 1st August 2012, 09:58 AM   #242
tinitus is offline tinitus  Europe
diyAudio Moderator R.I.P.
 
Join Date: Nov 2005
wow, I think switch works

position 1 and 2, all curcuits active
position 3, tube bypass, direct to tone curcuit with tube output muted
tone curcuit can be bypassed fast easy in all positions, having its own tone defeat switch

pole 11 does LED duty
and pole 5 is still free

well, might have nice to switch output
could be a tube direct out option
but havent figured that out yet
Attached Images
File Type: png bass pre layout 10xxx.png (94.3 KB, 16 views)
File Type: png bass pre front 121.png (34.1 KB, 16 views)
  Reply With Quote
Old 1st August 2012, 10:09 AM   #243
tinitus is offline tinitus  Europe
diyAudio Moderator R.I.P.
 
Join Date: Nov 2005
Quote:
Originally Posted by tinitus View Post
well, might have nice to switch output
could be a tube direct out option
but havent figured that out yet
hey, pole 5 on output might actually do that
  Reply With Quote
Old 1st August 2012, 12:22 PM   #244
tinitus is offline tinitus  Europe
diyAudio Moderator R.I.P.
 
Join Date: Nov 2005
yep, not 100% sure yet, but this might work

it should give 3 switch options, one with tube direct out, one with curcuits active, and one with tube bypass

shoot, small error on tube direct out
though, tone output is cut, its input is still connected tube out
not sure thats good
Attached Images
File Type: png bass pre layout 100.png (106.7 KB, 14 views)
  Reply With Quote
Old 2nd August 2012, 12:45 AM   #245
tinitus is offline tinitus  Europe
diyAudio Moderator R.I.P.
 
Join Date: Nov 2005
looks like I should let that 4P3T switch take care of signal in and out only, and not do the tube bypass
the added bonus is still tube out direct option, which actually wasnt planned
tube bypass will still possible with seperate switch, no problem
  Reply With Quote
Old 2nd August 2012, 09:11 PM   #246
tinitus is offline tinitus  Europe
diyAudio Moderator R.I.P.
 
Join Date: Nov 2005
Quote:
Originally Posted by tinitus View Post
.... and not do the tube bypass
yuoiee looks like it is possible
I think it works
Attached Images
File Type: png bass pre layout 101x.png (95.4 KB, 12 views)
  Reply With Quote
Old 2nd August 2012, 09:24 PM   #247
tinitus is offline tinitus  Europe
diyAudio Moderator R.I.P.
 
Join Date: Nov 2005
aqhh, nope, but very close missed the connection from tube out to tone curcuit but its there, somewhere
  Reply With Quote
Old 2nd August 2012, 09:26 PM   #248
shanx is offline shanx  Canada
diyAudio Member
 
Join Date: Dec 2010
Location: Quebec
Good stuff! I will take your word for it that it is working..I haven't checked it. Are the circuit boards finished up?
  Reply With Quote
Old 2nd August 2012, 10:11 PM   #249
tinitus is offline tinitus  Europe
diyAudio Moderator R.I.P.
 
Join Date: Nov 2005
Quote:
Originally Posted by shanx View Post
Are the circuit boards finished up?
no, need parts
desided a while back I would want mains power outlet from backpanel, using PowerCon's....and they were on back order
now they have them, and its time to order, but Im busy now

but a friend delivered my 'smoked' poly front plate today
Im running out of 'excuses' now
  Reply With Quote
Old 2nd August 2012, 11:55 PM   #250
tinitus is offline tinitus  Europe
diyAudio Moderator R.I.P.
 
Join Date: Nov 2005
Quote:
Originally Posted by shanx View Post
Good stuff! I will take your word for it that it is working..
thanx, almost sure this one will work
need to check it later, but it looks right

now I can order parts
Attached Images
File Type: png bass pre layout 105.png (92.0 KB, 2 views)
File Type: png bass pre front 125.png (34.1 KB, 3 views)
  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


Similar Threads
Thread Thread Starter Forum Replies Last Post
Switchable balanced / unbalanced input buffer nigeljking Analog Line Level 4 12th September 2011 01:03 PM
How to design input stage with specific input impedance/pot value mahleriana Tubes / Valves 0 16th November 2009 10:37 PM
Input Impedance Bengali Analog Line Level 7 15th August 2007 11:24 PM
Input impedance nhuwar Tubes / Valves 24 24th July 2007 12:11 AM
Input pot and input impedance Bricolo Parts 1 19th March 2003 02:59 PM


New To Site? Need Help?

All times are GMT. The time now is 03:13 PM.


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