Search found 135 matches

Thanks for the extra info. I overlooked it on an earlier post but I'm not sure what the 'flexible IC circuits' are, are they circuits you get made to spec like normal circuits boards or are we talking ...

Thanks for the extra info, very helpful. This may be the answer if repair pads aren't available in small quantities. Dave mentioned the longer pin sockets also and those are available on ebay. I was h ...

Thanks very much for all the info Dave.

Regarding the solder pads for the IC pins, can 'replacements' be had in some kind of repair kit? I just wan't to get it as good as possible. I searched for r ...

Conductive pen isn't going to be fine enough. I've watched demos of these on youtube, much too crude.

If anyone can advice on repairing the tracks and pads or where to buy such things please let me ...

I've attached a photo. A bodge attempt was made with wires but I want to make it better than that.
Many thanks.

Hello,
Can anyone please advice me on how to repair broken traces and IC pads? The board is double-sided and the traces are quite thin and close together. I want to make as good a job as I can. Is th ...

Thanks a lot for the information, it's worth giving it a try as soon as I can. I'll report back if it works, may not be for a while yet though.

Thanks a lot aladan, much appreciated.

Thanks very much tasteless, very helpful.

Hello,
I have an old elka string machine that needs a transistor replaced. The original is A09 which is NPN. I cannot find any datasheet online about it, does anyone know what a good replacement woul ...

There is one other thing that I wanted to do with this keyboard that I'm sure will be far easier. I would like to be able to disable the modulation via a switch. I know there are 2 modulation circuits ...

Hello,
I'm repairing a Korg Micropreset M-500 synthesizer that has one problem left that I'm not sure what the cause or solution is.

When portamento is on, the pitch of the instrument will drop up ...

Thanks aladan. It is the octave shift that I really wanted to do. Adding MIDI would be an interesting thing to do, and it so happens that I have an MD24, but not three of them. I'll have to give it so ...

Thank very much aladan, that is very thorough! Looks like I would have to try and find some SAJ110's or equivalent before anything else. They are socketed by the way.

I'm not one of those people wh ...

aladan, I appreciate all your help, thank you!

I think I have the same schematic as you, I just searched and found the one I have [url=http://manuals.fdiskc.com/flat/Elka%20Rhapsody%20490%20Schemat ...

Hello,
Just a quick general question really: Is it likely to be a reasonably painless task to add an octave shift to an old string machine/synth that uses an organ-style top-down octave divider?

A ...

I've read about software that will reduce noise in an image by layer several images of the same scene and average them together. I've searched for the same thing for audio but come up with nothing.
...

Thanks a lot diablojoy, I appreciate that very much.

There isn't a +15V supply in this machine, only -14V so that won't work for me unfortunately. I don't want to create a +15V supply in there as i ...

Thanks diablojoy,
Actually, it was getting a bit beyond my knowledge and as the drum machine wasn't expensive and doesn't sound remarkable anyway, I decided to just get a ribbon cable and carefully s ...

I connected one side of a micro-switch to 0V, the other side to a 100n capacitor and a 100k resistor. The other side of the resistor I connected to -14V (pull-up or down, you tell me!) and the other s ...

Thanks elmegil:
I think the way uncle describes it, that would end up being normally -14 with a pulse going up to gnd. That's the way it needs to be for this machine.

I tested with a +5V input sig ...

Thanks very much! I just happen to have a few 3906s here. I've attached a picture of my breadboard just to show that I am trying this Wink

.

I haven't connected anything to the input yet, I wanted to ...

Hello, I wonder if someone can help please:
First, my electronics knowledge is not great, so please bear that in mind.

I want to convert a 0-5V logic signal to a short -14-0V pulse. I have access ...

I've attached a scan of the relevant part of the schematic. It shows where the trigger pulses come out of IC1 and IC2 and where some pulses go through an inverter and some through NAND gates.

The s ...

Hope that helps!
Thanks, yes, it helps me realise that I don't know enough about it. Essentially I have a MIDI to trigger kit that converts note-on to +5V and note off to 0V. I was hoping to convert ...

Author	Message
Topic: Roland CR-78: Repair broken traces and pads
tonewill Replies: 10 Views: 10331	Posted: Tue Apr 10, 2018 3:20 pm Subject: Roland CR-78: Repair broken traces and pads Forum: DIY Hardware and Software » The Repair Shop
tonewill Replies: 10 Views: 10331	Thanks for the extra info. I overlooked it on an earlier post but I'm not sure what the 'flexible IC circuits' are, are they circuits you get made to spec like normal circuits boards or are we talking ...
Topic: Roland CR-78: Repair broken traces and pads
tonewill Replies: 10 Views: 10331	Posted: Thu Apr 05, 2018 7:37 am Subject: Roland CR-78: Repair broken traces and pads Forum: DIY Hardware and Software » The Repair Shop
tonewill Replies: 10 Views: 10331	Thanks for the extra info, very helpful. This may be the answer if repair pads aren't available in small quantities. Dave mentioned the longer pin sockets also and those are available on ebay. I was h ...
Topic: Roland CR-78: Repair broken traces and pads
tonewill Replies: 10 Views: 10331	Posted: Tue Apr 03, 2018 8:54 am Subject: Roland CR-78: Repair broken traces and pads Forum: DIY Hardware and Software » The Repair Shop
tonewill Replies: 10 Views: 10331	Thanks very much for all the info Dave. Regarding the solder pads for the IC pins, can 'replacements' be had in some kind of repair kit? I just wan't to get it as good as possible. I searched for r ...
Topic: Roland CR-78: Repair broken traces and pads
tonewill Replies: 10 Views: 10331	Posted: Thu Mar 29, 2018 2:34 am Subject: Roland CR-78: Repair broken traces and pads Forum: DIY Hardware and Software » The Repair Shop
tonewill Replies: 10 Views: 10331	Conductive pen isn't going to be fine enough. I've watched demos of these on youtube, much too crude. If anyone can advice on repairing the tracks and pads or where to buy such things please let me ...
Topic: Roland CR-78: Repair broken traces and pads
tonewill Replies: 10 Views: 10331	Posted: Mon Mar 26, 2018 5:52 am Subject: Roland CR-78: Repair broken traces and pads Forum: DIY Hardware and Software » The Repair Shop
tonewill Replies: 10 Views: 10331	I've attached a photo. A bodge attempt was made with wires but I want to make it better than that. Many thanks.
Topic: Roland CR-78: Repair broken traces and pads
tonewill Replies: 10 Views: 10331	Posted: Sat Mar 24, 2018 9:13 am Subject: Roland CR-78: Repair broken traces and pads Forum: DIY Hardware and Software » The Repair Shop
tonewill Replies: 10 Views: 10331	Hello, Can anyone please advice me on how to repair broken traces and IC pads? The board is double-sided and the traces are quite thin and close together. I want to make as good a job as I can. Is th ...
Topic: Korg micropreset M-500
tonewill Replies: 2 Views: 5677	Posted: Tue Nov 04, 2014 8:14 am Subject: Korg micropreset M-500 Forum: DIY Hardware and Software » The Repair Shop
tonewill Replies: 2 Views: 5677	Thanks a lot for the information, it's worth giving it a try as soon as I can. I'll report back if it works, may not be for a while yet though.
Topic: Top-down octave divider keyboard
tonewill Replies: 12 Views: 10273	Posted: Mon Mar 17, 2014 3:32 am Subject: Top-down octave divider keyboard Forum: DIY Hardware and Software
tonewill Replies: 12 Views: 10273	Thanks a lot aladan, much appreciated.
Topic: A09 transistor
tonewill Replies: 2 Views: 4873	Posted: Fri Mar 14, 2014 3:49 am Subject: A09 transistor Forum: DIY Hardware and Software » The Repair Shop
tonewill Replies: 2 Views: 4873	Thanks very much tasteless, very helpful.
Topic: A09 transistor
tonewill Replies: 2 Views: 4873	Posted: Sun Mar 09, 2014 10:18 am Subject: A09 transistor Forum: DIY Hardware and Software » The Repair Shop
tonewill Replies: 2 Views: 4873	Hello, I have an old elka string machine that needs a transistor replaced. The original is A09 which is NPN. I cannot find any datasheet online about it, does anyone know what a good replacement woul ...
Topic: Top-down octave divider keyboard
tonewill Replies: 12 Views: 10273	Posted: Sat Mar 08, 2014 7:13 am Subject: Top-down octave divider keyboard Forum: DIY Hardware and Software
tonewill Replies: 12 Views: 10273	There is one other thing that I wanted to do with this keyboard that I'm sure will be far easier. I would like to be able to disable the modulation via a switch. I know there are 2 modulation circuits ...
Topic: Korg micropreset M-500
tonewill Replies: 2 Views: 5677	Posted: Sun Mar 02, 2014 7:57 am Subject: Korg micropreset M-500 Subject description: portamento problem Forum: DIY Hardware and Software » The Repair Shop
tonewill Replies: 2 Views: 5677	Hello, I'm repairing a Korg Micropreset M-500 synthesizer that has one problem left that I'm not sure what the cause or solution is. When portamento is on, the pitch of the instrument will drop up ...
Topic: Top-down octave divider keyboard
tonewill Replies: 12 Views: 10273	Posted: Tue Jan 21, 2014 4:17 pm Subject: Top-down octave divider keyboard Forum: DIY Hardware and Software
tonewill Replies: 12 Views: 10273	Thanks aladan. It is the octave shift that I really wanted to do. Adding MIDI would be an interesting thing to do, and it so happens that I have an MD24, but not three of them. I'll have to give it so ...
Topic: Top-down octave divider keyboard
tonewill Replies: 12 Views: 10273	Posted: Tue Jan 21, 2014 12:59 pm Subject: Top-down octave divider keyboard Forum: DIY Hardware and Software
tonewill Replies: 12 Views: 10273	Thank very much aladan, that is very thorough! Looks like I would have to try and find some SAJ110's or equivalent before anything else. They are socketed by the way. I'm not one of those people wh ...
Topic: Top-down octave divider keyboard
tonewill Replies: 12 Views: 10273	Posted: Mon Jan 20, 2014 4:32 am Subject: Top-down octave divider keyboard Forum: DIY Hardware and Software
tonewill Replies: 12 Views: 10273	aladan, I appreciate all your help, thank you! I think I have the same schematic as you, I just searched and found the one I have [url=http://manuals.fdiskc.com/flat/Elka%20Rhapsody%20490%20Schemat ...
Topic: Top-down octave divider keyboard
tonewill Replies: 12 Views: 10273	Posted: Sun Jan 19, 2014 12:58 pm Subject: Top-down octave divider keyboard Subject description: would like to add octave shift Forum: DIY Hardware and Software
tonewill Replies: 12 Views: 10273	Hello, Just a quick general question really: Is it likely to be a reasonably painless task to add an octave shift to an old string machine/synth that uses an organ-style top-down octave divider? A ...
Topic: Reduce noise by layering sounds
tonewill Replies: 0 Views: 6557	Posted: Sat Jun 08, 2013 10:50 am Subject: Reduce noise by layering sounds Forum: How-tos
tonewill Replies: 0 Views: 6557	I've read about software that will reduce noise in an image by layer several images of the same scene and average them together. I've searched for the same thing for audio but come up with nothing. ...
Topic: External triggers fo analogue drum machine
tonewill Replies: 16 Views: 8408	Posted: Thu Jun 06, 2013 1:58 pm Subject: External triggers fo analogue drum machine Forum: DIY Hardware and Software
tonewill Replies: 16 Views: 8408	Thanks a lot diablojoy, I appreciate that very much. There isn't a +15V supply in this machine, only -14V so that won't work for me unfortunately. I don't want to create a +15V supply in there as i ...
Topic: External triggers fo analogue drum machine
tonewill Replies: 16 Views: 8408	Posted: Tue Jun 04, 2013 4:03 pm Subject: External triggers fo analogue drum machine Forum: DIY Hardware and Software
tonewill Replies: 16 Views: 8408	Thanks diablojoy, Actually, it was getting a bit beyond my knowledge and as the drum machine wasn't expensive and doesn't sound remarkable anyway, I decided to just get a ribbon cable and carefully s ...
Topic: Convert 0-5V logic to another range
tonewill Replies: 6 Views: 3397	Posted: Tue Jun 04, 2013 9:33 am Subject: Convert 0-5V logic to another range Forum: DIY Hardware and Software
tonewill Replies: 6 Views: 3397	I connected one side of a micro-switch to 0V, the other side to a 100n capacitor and a 100k resistor. The other side of the resistor I connected to -14V (pull-up or down, you tell me!) and the other s ...
Topic: Convert 0-5V logic to another range
tonewill Replies: 6 Views: 3397	Posted: Tue Jun 04, 2013 8:18 am Subject: Convert 0-5V logic to another range Forum: DIY Hardware and Software
tonewill Replies: 6 Views: 3397	Thanks elmegil: I think the way uncle describes it, that would end up being normally -14 with a pulse going up to gnd. That's the way it needs to be for this machine. I tested with a +5V input sig ...
Topic: Convert 0-5V logic to another range
tonewill Replies: 6 Views: 3397	Posted: Tue Jun 04, 2013 7:01 am Subject: Convert 0-5V logic to another range Forum: DIY Hardware and Software
tonewill Replies: 6 Views: 3397	Thanks very much! I just happen to have a few 3906s here. I've attached a picture of my breadboard just to show that I am trying this . I haven't connected anything to the input yet, I wanted to ...
Topic: Convert 0-5V logic to another range
tonewill Replies: 6 Views: 3397	Posted: Tue Jun 04, 2013 1:50 am Subject: Convert 0-5V logic to another range Forum: DIY Hardware and Software
tonewill Replies: 6 Views: 3397	Hello, I wonder if someone can help please: First, my electronics knowledge is not great, so please bear that in mind. I want to convert a 0-5V logic signal to a short -14-0V pulse. I have access ...
Topic: External triggers fo analogue drum machine
tonewill Replies: 16 Views: 8408	Posted: Mon Jun 03, 2013 11:13 am Subject: External triggers fo analogue drum machine Forum: DIY Hardware and Software
tonewill Replies: 16 Views: 8408	I've attached a scan of the relevant part of the schematic. It shows where the trigger pulses come out of IC1 and IC2 and where some pulses go through an inverter and some through NAND gates. The s ...
Topic: External triggers fo analogue drum machine
tonewill Replies: 16 Views: 8408	Posted: Mon Jun 03, 2013 8:03 am Subject: External triggers fo analogue drum machine Forum: DIY Hardware and Software
tonewill Replies: 16 Views: 8408	Hope that helps! Thanks, yes, it helps me realise that I don't know enough about it. Essentially I have a MIDI to trigger kit that converts note-on to +5V and note off to 0V. I was hoping to convert ...