Designing Roland TR-808 Mods for Doctor Mix - Synthchaser #136

Claudio from @Doctormix has been busy repairing and modding his Roland TR-808 drum machine and asked if I could help design some mods for the hand claps. In this video I show you my approach to designing mods, and give a little introduction to RC time constants, which are used in all analog synthesis circuits.

See and hear the mods I came up with in action in the new @Doctormix video here, and be sure to subscribe to the awesome @Doctormix channel!

Details of the mods designed in this video are available here:

Parts, service and synthesizers available on my website. I buy broken synthesizers!

[nexorenity]

Such an underrated channel. Thank you for these awesome videos!

[wmoecke]

I wish you were my Analog Electronics teacher back in the days I was a student.

[ScottsSynthStuff]

Clever trigger mod on your 555 circuit. I've always just used a dual 556 and hooked them up sequentially, so one triggers the other. That lets you get full 0-100% duty cycle on the PWM.

[StuderSSL]

Great video! I really enjoyed watching you explain the schematic.

[telefunkian]

This has to be one of my favourite Synthchaser videos! Thanks for the theory, explained at a nice level, not too high, not too low... Dr. Mix is going to end up with the most flexible 808 claps ever!

[PnPModular]

Amazing video really enjoying your breakdown!! Love this kind of content thank you

[mrkey-music]

Very interesting video! Sooner or later I need to mod also my OB8 with its power up monitor circuit. Anyway I love these collaborations between Youtubers, and Claudio is really funny especially when he sings and plays Samba de Orfeu with its Prophet 5 :-)

[BasharAAhmad]

Thank you man, this will be one of my favorite channels

[matszh]

You don’t see service manuals like that anymore...Good work!

[PWMaarten]

I’m not gonna open up my 808 for this (that thing is a hell to service) but I found a document on my computer downloaded ages ago. These (partially) redrawn schematics show a 27n capacitor instead of the 2n7 from the original schematic.

[RaquelFoster]

This channel is so much more my vibe than Doctormix LOL. He can't even go 10 seconds without stopping to shout at you to like & subscribe, stopping to tell you about some course he's selling, or just compulsively screaming "NEXT!" It really surprises me that 740k people like that kind of verbal abuse. Apparently it's a 'me' problem.

I wish Louis Rossmann was still doing nerdy videos of soldering things. At least I've got Synthchaser!

[sawsquaresinetube]

“The decade boxes are cool” -Synthchaser, 2021 😁

[SQueme]

Nice !! want to "ear" the final white noise mixed with this enveloppe !!! may be not that simple ?

[rvwbnlb]

Yeah but can Synthchaser tell me why my DX21 makes odd noises and says "check level 30" on its test routine, when it should say "check level" and put out a 440hz sine wave is it a dud YM3012 chip or something else ? great video

[TheAddyf]

Would be lovely if you could sell diy kits for that stuff. I would buy it :)

[TheAddyf]

With the Dinsync replica 808 there would be a lot of people interested i guess

[virtualcrimes]

Is there an easy way to just disable the reverb with a switch?

[TheAddyf]

Or Corporate with one whos doing diy kits already