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#91
Synths & Samplers / Re: Casio SK1/5/8 mods - Phat ...
Last post by wax+wire - August 23, 2020, 11:33:48 AMI've put up a little video of the SK1 memory expander here.
https://www.reddit.com/r/CircuitBending/comments/if0r40/casio_sk1_sample_memory_expansion_x64/
It is a bit more challenging than the SK5/8 and needs 2xRAM chips, 1 logic controller, 2 RAM chip controllers, 6 resistors, 3 switches and the rotary encoder. Having spent a fair bit of time doing it, I actually think it is the sort of thing that could benefit from a unique PCB being made up. You could have it so that you basically just desolder the old two RAMs and then solder in this PCB on top.
Not sure if that is something people would be interested in?
The other challenge is mounting the controller stuff. I really wanted the encoder and bank switches close to the sample button. It just makes sense! To do that I had to chop the legs off my mini DPDT switches to get them down to 7mm deep and then solder onto the stumps. a bit silly I know. I reckon you could make something that mounted onto a plate that you installed onto the SK1and cut a whole through it with the wires.
https://www.reddit.com/r/CircuitBending/comments/if0r40/casio_sk1_sample_memory_expansion_x64/
It is a bit more challenging than the SK5/8 and needs 2xRAM chips, 1 logic controller, 2 RAM chip controllers, 6 resistors, 3 switches and the rotary encoder. Having spent a fair bit of time doing it, I actually think it is the sort of thing that could benefit from a unique PCB being made up. You could have it so that you basically just desolder the old two RAMs and then solder in this PCB on top.
Not sure if that is something people would be interested in?
The other challenge is mounting the controller stuff. I really wanted the encoder and bank switches close to the sample button. It just makes sense! To do that I had to chop the legs off my mini DPDT switches to get them down to 7mm deep and then solder onto the stumps. a bit silly I know. I reckon you could make something that mounted onto a plate that you installed onto the SK1and cut a whole through it with the wires.
#92
Synths & Samplers / Re: Casio SK1/5/8 mods - Phat ...
Last post by gmeredith - August 23, 2020, 10:59:34 AMYes they are really shallow, the 4-gang is only 17mm deep. It just might do it.
I have just confirmed that indeed the memory expansion also expands the sequencer - on each of the memory banks, I can record a different sequence and it retains it for that memory slot. Like you, I don't really use that feature, especially since my SK8 has MIDI in, so i sequence it from my MMT8 sequencer, so I never knew if it ever did work, until just now
I have just confirmed that indeed the memory expansion also expands the sequencer - on each of the memory banks, I can record a different sequence and it retains it for that memory slot. Like you, I don't really use that feature, especially since my SK8 has MIDI in, so i sequence it from my MMT8 sequencer, so I never knew if it ever did work, until just now
#93
Synths & Samplers / Re: Casio SK1/5/8 mods - Phat ...
Last post by wax+wire - August 22, 2020, 06:51:38 AMMouser:
https://au.mouser.com/ProductDetail/652-PTD904-1015FA104
~$4.00AUD -- and free postage if you order over $60 in australia atm. I recommend doing 3, one for the cutoff, one for the resonance and one for the envelope in.
Have you every played with the "record" function of the SK8? I just checked on the SK1, and because it writes the sequences to one of the RAM chips, with the SK1 64xMemory Expansion you can store 64 sequences.
https://au.mouser.com/ProductDetail/652-PTD904-1015FA104
~$4.00AUD -- and free postage if you order over $60 in australia atm. I recommend doing 3, one for the cutoff, one for the resonance and one for the envelope in.
Have you every played with the "record" function of the SK8? I just checked on the SK1, and because it writes the sequences to one of the RAM chips, with the SK1 64xMemory Expansion you can store 64 sequences.
#94
Synths & Samplers / Re: Casio SK1/5/8 mods - Phat ...
Last post by gmeredith - August 22, 2020, 05:53:29 AMAwesome work Joel. Dug out the SK8 loaded with all the mods yesterday and noodled around playing stuff. I'm going to rebuild it. Either you or Sam got hold of those really tiny quad pots I think - where did you get them? I'm going to replace all mine
#95
Synths & Samplers / Re: Casio SK1/5/8 mods - Phat ...
Last post by wax+wire - August 19, 2020, 02:46:20 AMThanks Graham
Joel here. Would be good to see a little more action on this forum again.
With the Phat Philter Bank a few things that have been done:
1. Making the envelope points and the audio points on the CASIO SK1 correct. There were a few instructions around the net that resulted in the PPB (and the SLOW AD mod) not working perfectly. I'll share a schematic with exactly where to get those spots on the CASIO SK1's PCB.
2. Modifiying Graham's initial circuit slightly so you can control how much the envelope from the Casio SK (1/5/8) effects the filter cut-off AND also mix an LFO signal with an envelope signal. allows for some really nice filter opening combinations
With the Memory Expansion it is :
* 64x Memory expansion for the SK1 (so 64 samples, AND I'm fairly sure 64x 400 note sequences AND memory retention when switched off).
* Same with the SK5/8 except only 16x expansion (but that is 16x4 samples, so 64 samples) and no sequencer (actually, I'm not sure about that.. I've never used the record function)
* fairly cheap, about $30AU for all the parts (SK1 is a bit more expensive)
Joel here. Would be good to see a little more action on this forum again.
With the Phat Philter Bank a few things that have been done:
1. Making the envelope points and the audio points on the CASIO SK1 correct. There were a few instructions around the net that resulted in the PPB (and the SLOW AD mod) not working perfectly. I'll share a schematic with exactly where to get those spots on the CASIO SK1's PCB.
2. Modifiying Graham's initial circuit slightly so you can control how much the envelope from the Casio SK (1/5/8) effects the filter cut-off AND also mix an LFO signal with an envelope signal. allows for some really nice filter opening combinations
With the Memory Expansion it is :
* 64x Memory expansion for the SK1 (so 64 samples, AND I'm fairly sure 64x 400 note sequences AND memory retention when switched off).
* Same with the SK5/8 except only 16x expansion (but that is 16x4 samples, so 64 samples) and no sequencer (actually, I'm not sure about that.. I've never used the record function)
* fairly cheap, about $30AU for all the parts (SK1 is a bit more expensive)
#96
Synths & Samplers / Casio SK1/5/8 mods - Phat Phil...
Last post by gmeredith - August 19, 2020, 12:58:25 AMHi everyone! Sorry for dropping off the scene, a combination of hectic work life and also being locked out of logging in to this forum for ages - a stupid "time out" error on this server. Another user had the same issue and posted that suddenly they were back in today, so I logged in, and here I am again!
Lots and Lots of things have happened:
1. I retired, which means I get to play with all my toys more again, and
2. A bunch of people have been messing with my Phat Philterbank (PPB) and other mods and improving them (making it easier to build without making mistakes - it was almost an impossible circuit to build and get functioning with my layout, even for me!). They also got the PPB adapted to the SK1 and it sounds AWESOME on it (Thanks to Joel and Sam!)
3. They have also adapted the SK5/8 sample memory expansion mod to the SK1. This was quite difficult to nut out as the SK1 uses a different sort of ram to the later SK5/8 that run standard SRAM. They are also working on making the sample memory battery backed, so you retain the SK1 samples when powered off, like the SK5/8 does. These guys are heroes!
Watch this space for details and videos
Cheers, Graham
Lots and Lots of things have happened:
1. I retired, which means I get to play with all my toys more again, and
2. A bunch of people have been messing with my Phat Philterbank (PPB) and other mods and improving them (making it easier to build without making mistakes - it was almost an impossible circuit to build and get functioning with my layout, even for me!). They also got the PPB adapted to the SK1 and it sounds AWESOME on it (Thanks to Joel and Sam!)
3. They have also adapted the SK5/8 sample memory expansion mod to the SK1. This was quite difficult to nut out as the SK1 uses a different sort of ram to the later SK5/8 that run standard SRAM. They are also working on making the sample memory battery backed, so you retain the SK1 samples when powered off, like the SK5/8 does. These guys are heroes!
Watch this space for details and videos
Cheers, Graham
#97
Banter / Re: Holding hands with a girl
Last post by gmeredith - August 19, 2020, 12:45:54 AMSame here! I've been locked out for almost years, all of a sudden I'm back in. I can finally answer people's replies!
#98
Circuitbending discussion / Re: VSS-30 bend points
Last post by Critical Vibrations - August 06, 2020, 05:22:38 AMFor posterity, here is an updated link to AN7140 datasheet: https://industrial.panasonic.com/content/data/SC/ds/ds4/AN7140_E_discon.pdf
Backup link: https://www.digchip.com/datasheets/parts/datasheet/353/AN7140-pdf.php
Backup link: https://www.digchip.com/datasheets/parts/datasheet/353/AN7140-pdf.php
#99
Synths & Samplers / Re: Yamaha vss30 service manua...
Last post by Critical Vibrations - August 06, 2020, 04:42:49 AMFor redundancy, here is another link to the VSS-30 Service Manual: https://archive.org/details/YamahaVSS30Service
And for extra giggles, here's a link to the VSS-30 Owner's Manual: http://midimanuals.com/manuals/yamaha/vss-30/owners_manual/
And for extra giggles, here's a link to the VSS-30 Owner's Manual: http://midimanuals.com/manuals/yamaha/vss-30/owners_manual/
#100
circuitbenders.co.uk CB55 - DIY Boss DR55. / Olegtron 4060 mk2 - good compa...
Last post by channelite - July 27, 2020, 03:33:29 AMI finally finished my CB55 build, I planned to put it in a Tupperware as a makeshift enclosure. Things weren't going well, the tupperware was too small, I couldn't access the jumper wires for the pots and outputs. Then I realized I should try the CB55 with my Olegtron 4060 mk2 that I got a month ago. It's actually I great solution for the CB55. I took my CB out of the tupperware, put some legs on it and the Olegtron provides almost all the connections needed. First it can provide 12v power, since the Olegtron can be powered up to 15v. It has 4 ring tip connections to provide 8 audio outputs. It has a divider which is an alternative sequencer to TRIG_IN1. You can add some capacitors to the divider to great some interesting rhythms. Turning down the current knob causes the cb55 to freak out a bit but sounding really cool. I put a 100 ohms resistor in accent jumper and I think a 10k resistor for the volume. Tone I left blank. So the two devices are connected with a bunch on jumper wires and I don't need an enclosure for the cb55. I'll have to post a video of this setup.
https://www.olegtron.com/olegtron-4060
https://www.olegtron.com/olegtron-4060