Friday, August 23, 2019

Knobs & Panels...

Trying to maintain the original look as much as possible... Without the strange lumps of rubber...

Thursday, August 15, 2019

EPROMs

To get my Z80 board into a functioning state I need to get the code into it... One interesting thing that I had sort of forgotten in the modern world of Electrically Erasable memory is the venerable EPROM. I have memories of cycling through dozens of 2716 EPROM's to debug some Z8 assembler late into the evening for a contract I was doing... My old EPROM programmer needs an ISA bus processor and it hasn't really been used for 20+ years. Even the newer one at work, which uses a parallel port, is non starter for pretty much any hardware from the last 10 or so years. The quickest way out is this thing from e-bay, that seems to work OK... It is still cheaper that the old old EPROM programmer from 1987ish and there has been 30 years inflation since then.

Tuesday, August 13, 2019

Z80 all over again...

Back to the Z80! It's been a long time but that was the processor of the 80's...

Thursday, August 8, 2019

Making a monosynth...

Well for a laugh I am making a early 80's monosynth! This is the donor keyboard from a rather dodgy Japanese Hammond Organ -- the Piper II. The rest of the build is getting there. The Control electronics is done 100% and the front panel PCB (quite large) is at about 98% -- just need to do the filters and output stages on their own PCB.... Hopefully for completion in the very short term!

Tuesday, December 13, 2016

Minimoog drifts to top of the pile again...

After about 20+ years the Minimoog parts are at least in close proximity again...

Saturday, March 26, 2016

Galon Oscillator

I have made a sort of spin-off Blog to cover the DIY Braids that I have been making. It is over here:
galon-oscillator.blogspot.com

Monday, December 14, 2015

FPGA Oscillator

This has turned up from WaveShare. It is really very reasonable as I don't think that I can buy the FPGA device for that. I plan to bash out a something themed on the ShapeShifter. It won't be as sophisticated (or any where near as expensive). I always enjoyed a bit of VHDL coding but the requirement for it is sadly thin on the ground these days. I was a bit surprised that Cyclonix really just bolt an Altera evaluation board onto a bunch of DAC/ADC and analog interface device on a panel. From the reading I have done, they use the NIOS soft processor -- I was going to skip that bit and stick an ARM in beside the FPGA as the compiler/debugging is generally a bit ropey on an environment with such a small user base. That will leave more space for Audio processing and waste less resources on the FPGA.