DOBOZ - Touch Sensing Note Memory - Buchla format 4U --- part 1

These are my build notes for the DOBOZ TSNM module

 I like the compact format.

Its a sequencer +

 

Here are some pics of the raw PCBs

 

There are two versions of this module .

One uses a teensy 3.2, and a second uses a teensy 4.0

i bought this board many years ago when teensy's 3.2 were plentiful.

I recently received a NOS 3.2, so thought I'd finish this build.

My board is from 2017. rev 1.0

MPR121 breakout board.

Links

+ Official site

+ BOM 

+ official build notes

SEMICONDUCTORS first

Orientation of IC1-IC5 and IC7, Q1, D1 and D2 is clearly designated on the PCB. 

74HC595 2 IC3, IC4 - shift registers

mouser 595-SN74HC595DR

 

 

OPA171

IC5 

SOIC-8 operational amplifier 

mouser 595-OPA171AIDR

TL072

 IC1 

SOIC-8 dual operational amplifier 

mouser 595-TL072CDR

 

 

ADP150-3.3V 

IC7 TSOT-5 linear voltage regulator 

Mouser 584-ADP150AUJZ-3.3R7

 

"The trickiest part may be the DAC8560 (IC2), it’s a VSSOP-8 device. 

This is hand soldered

 

Use lots of flux , a fine soldering tip and fine solder.

... and a steady hand

--------------

MMBT3904 

Q1 SOT-23 NPN bipolar transistor 

Mouser ;512-MMBT3904

I didn't have this exact transistor.

I used this instead:

Encoder: ordered and arrived.

Mouser No:

858-EN11-HSM1BF20

Mfr. No:

EN11-HSM1BF20

Mfr.:

TT Electronics

 

 

Resistors..

Some of the resistors need to have 0.1% tolerance

2 x 100K, (R1 & R15)

1K x 1, 

27k, 

33k, 

teensy 3.2

mouser

coco.