Eurorack DIY: 909 Hi Hat (Episode 1)
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- Опубліковано 29 сер 2024
- I need some drums in my Eurorack, so I'm building some 909 modules.
Let's continue the build series with a design analysis of the TR-909 Hi Hat Voice block diagram and explore the wonderful world of vintage UV-EPROMs.
You can find all of my designs on my GitHub:
github.com/tki...
Some modules that I have designed myself are available in my Tindie shop:
www.tindie.com...
Thank you for watching!
#eurorack #synthdiy
Check this out:
ua-cam.com/video/6wmFgJba5mY/v-deo.html
love that potentiometer station!
Thanks a lot, Benjie!
It's a really useful tool
@@MeeBilt There goes another one of your projects on my todo list! 😅It also looks like a good 3D modeling exercise for the case huh.
I'd probably make one with different tapers, like A100k and B100k options. 🤔
@@benjiaomodular That sounds like a really good idea 👍
Hat sounds are awesome.
Thank you very much!
This is pure magic Tommy!!!
Thanks a lot, Gareth!
Defintely not a beginner one !
Wow I love that HHat so much !
Thanks HarmO!
Great video! Ohhh already waiting for episode 2...
It's in the making - I got the PCBs today
Good job, and it sounds great!
Thanks a lot, Patrik!
love your videos!
Glad you like them! Thanks!
This is awesome. Of course the kick became legendary, but also the samples are such a big part of the 909 sound.
I’m already excited for the next installments.
Thanks Bas! All the sounds from the TR-909 are legendary ☺
But the Kick and the Hihats have a special place in Techno and House, IMO
@@MeeBilt you’re right about that. But the samples do set it apart compared to the purely synthesized sound of the 808 for instance.
Let’s build the circuit with ya
Enjoy the build! 😉
Imagine custom samples with this approach - a rotary switch to select from a set of samples from the (E)EPROM? One step at a time and a home made Fairlight CMI is born :) Great video!
Thanks Krzysztof - Yeah, we are getting there step by step 😅😉
much better to use a card, like Nintendo.
It's not so easy as you think, the eprom has 14 address pins, the logic in the TR-909 is fixed the ic's start counting up and outputting the data in the eprom, accept for the hi hat, witch are 2 samples. it's only 32.000 of samples, like 3/4 of a second at 8 bit at 44kH1 if normal audio rate was used, but 6 bits are used. you could do this with a Arduino ATmega328P, pic pic18f452 or one with a bit more storage and safe ic's, lots of work.
Darn I was really hoping there was a 909 hihat build that wouldn't really on flashing vintage chips.
Juanito (M4TM) and Tyler (thingsmadesimple) are working on a microcontroller based version that is pretty cool.
ua-cam.com/video/KZcoboLzddc/v-deo.htmlsi=gRIGkDgqxaS8Su3a
You can use AT27C256R by Microchip eprom and they still make them new.
How did you get the samples? could you provide those to me?
Hello Analogdude, yeah AT27C256R should work fine too.
I downloaded the samples from somewhere a long time ago, can't remember where I got them. But I will provide the files together with the rest of the design documents on my Github in the next installment of the video
@@MeeBilt Thanks, You would probably make many people happy, i asked TI to make a new batch of a CD4006 and couple of days ago, lets' wait and see if they do. I'll keep asking.
I got the eproms, but no eprom reader, i had the files as well long time ago,
I have the 9090 project, but unfortunately never finished it, but would probably have to dig various hard drives.
@@MeeBilt You could try to join all 3 samples in a Microchip Fubarino witch has 256KB flash, more than enough to save 3 32K samples and 44 pins. only 23€, cheaper than a Arduino, 32 bit and 64K sram, 48MH. rather than recreating the orginals. it's easy, just cycle to through the 32k sampes and output 6 bits and you could brake the hihat sample into 2 output. 1 module having all 3 sampled instruments, simply attach the original envelops and filters.
@@AnalogDude_ That's a really cool idea.
@@MeeBilt Use 3 x 74HC174 as dac's for each sample and a 4th 74HC147 for velocity via a sample and hold on the same 6 bit bus.
See schematics of Roland Juno 106, the CV goes via sample and hold mechanism and CD4051 for all 6 voices. The 74hc174 is a cool device.