Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Synthesizer power distribution
Synthesizer power distribution
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
Thread Tools Search this Thread
Old 25th February 2013, 04:38 PM   #11
argonrepublic is offline argonrepublic  Canada
diyAudio Member
Join Date: Apr 2005
Location: Simcoe Ont
Pins 9, 10, 11 and 12 put out 12 Volts. Based on the datasheet for the HC139, the outputs can only be High on these pins in a group of 4. There is no option for them being all four "low". Based on this circuit, what is going to be required to provide collector voltage?
Attached Images
File Type: png led driver 2.PNG (22.5 KB, 10 views)

Last edited by argonrepublic; 25th February 2013 at 04:41 PM.
  Reply With Quote
Old 25th February 2013, 06:17 PM   #12
Mooly is offline Mooly  United Kingdom
diyAudio Moderator
Mooly's Avatar
Join Date: Sep 2007
Synthesizer power distribution
Those transistors will be driven by a "logic" type output. To turn a transistor on those pins have to go to zero volts. That pulls base current through the E-B junction and whatever voltage is on the emitter (5V ?) then appears at the collector as well. But... the drive may be strobed and not simply static voltages.

You need a scope to check the clock (and for most fault finding really)

Faults usually fall into certain categories. You must check all the supplies. You must check any clock oscillators are running and you must check the status of any reset pins on any microprocessors.

You need to find a way into a fault if you are struggling. Is there a power on LED ? Does it light ? If not then look purely for the reason why that is.
  Reply With Quote


Synthesizer power distributionHide 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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Synthesizer power supply argonrepublic Power Supplies 1 6th February 2013 05:52 AM
Synthesizer power supply argonrepublic Power Supplies 4 4th February 2013 11:37 AM
3 Way Power Distribution kucharcity Multi-Way 46 14th May 2008 11:17 PM
Synthesizer Power supply argonrepublic Parts 0 1st January 2006 09:09 AM
power distribution robotnation Multi-Way 6 11th December 2005 11:27 PM

New To Site? Need Help?

All times are GMT. The time now is 11:34 AM.

Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright ©1999-2017 diyAudio