KicadJE_ADSR_Mega32

Initial ATMega32 board (EU-5 ADSR32)

Second PT2399 reverb (EU-4 Reverb)

Third VCO - based on Format VCO (VCO3)

Purpose

1 - try out ATMega 32 for digital applications with more IO

2 - PT2399 2nd revision

3 - Formant VCO modification 3rd rev

Status - delivered

Initial

Stage	Detail	Status
create material	sch/pcb	OK
	gerber	OK
production		OK
	produced	OK
	delivered	OK

Preliminary validation

Test	Detail	Status
Initial Inspection		OK
Initial Technical Test	ADSR	ICSP:ok - Serial: no success - LED: OK - POT:no success
Initial Technical Test	Reverb	OK
Initial Technical Test	VCO3	OK
Initial Product Test	ADSR	ADC not working due to GND conn to Aref
Initial Product Test	Reverb	Works nicely (tested with 5V from 16pin Doepfer
Initial Product Test	VCO3	Working - output and "sine" - Square not working - UMX1 works nicely as CV - FM works - LFO works - POT's reversed...

Secondary validation

Test	Detail	Status
Product Test
Product Test
Product Test	VCO	Square not working
Quality
Quality
Quality	VCO3	Range from 20Hz
Long Term Product Test
Long Term Product Test
Long Term Product Test
Power Draw
Power Draw
Power Draw	VCO3	+5V 1mA, +12V 7mA, -12V 6mA

Errata

Errata - VCO3

1 - ALL pots are reversed

Errata - ADSR Mega32

1 - ADC not working due to GND conn to Aref - fix by bending leg so it does not get soldered

Issues and Notes

VCO 3

1 - C104 needs to be bigger (tried w 20uf that worked nicely)

2 - Square circuit not working

3 - Unsure of trigger feature

4 - ALL pots are reversed

5 - Consider adding LED

Pictures

VCO3

Reverb

Inspiration from

https://github.com/promesoft/KicadJE_EffectsUnit1

https://github.com/promesoft/ArduinoJE_ADSR

https://github.com/promesoft/KicadFormantVCO