Johansen Engineering KiCadJE_LFO_1.2 (Rev B)

Analogue LFO - minor adjustments - new jacks (PJ321 -> pj324) - remove Sine Adj

555 Based LFO - minor adjustments - new jacks (PJ321 -> pj324) - remove XXX

NAND - Footprint adj

Purpose

Fix issues with RevA

555 LFO

+/- 10V LFO Square, Triangle, Sine

2 frequency ranges

LFO

+/- 10V LFO Square, Triangle, Sine

NAND

NOT Gate (pull dn) - NAND Gate (both pull up) - AND Gate (both pull up)

0-10V output - CMOS input

D-Flip Flop

0-10V output - CMOS input

MMX

+-10V Input/output - DC couple

Top - 3 input mixer with phase reversal

Bottom - 3 mult output with phase reversal - uses mixer output as input if not applied to mult input

Status - In the mail

Initial

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

Preliminary validation

Test	Detail	Status
Initial Inspection		OK
Initial Technical Test	LFO555
		PJ321 should be 1 mm further from the front, center tap works - minor footprint twist in pj324
Initial Technical Test	NAND
		cut power plane and add 20k across to fix not blowing other units due to hard pull up on tip.
Initial Product Test	LFO
Initial Product Test	LFO555	Sine and Tri not working - needs ac coupling from square - needs dc compensation
Initial Product Test	MMX2
Initial Product Test	NAND	Now working with 4093 - needs pull up resistors and I/O protection
Initial Product Test	FlipFlop

Secondary validation

Test	Detail	Status
Product Test	LFO
Product Test	LFO555	working right - tri and sine needs tweaking of waveforms
Product Test	MMX2
Product Test	NAND	working - see issues
Product Test	FlipFlop	Working as intended except for LED's
Quality	LFO
Quality	LFO555
Quality	MMX2
Quality	NAND
Quality	FlipFlop
Long Term Product Test
Power Draw

Errata

Errata - LFO

Errata - LFO555

Errata - MMX2

Errata - Flip-Flop

Errata - NAND

Hard pull up to 12 can fry other units !!! Add resistor pull up

Output protection (series resistor?)

Issues and Notes

LFO

555 LFO

AC coupling of Square should be considered - internal and at least DC adj external

bias current compensation (eg. 10k to GND)

Flip-Flop

MMX2

NAND

Pictures

MMX2

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Johansen Engineering KiCadJE_LFO_1

Initial Analogue LFO

Purpose

Status - Evaluated

Initial

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

Preliminary validation

Test	Detail	Status
Initial Inspection		OK
Initial Technical Test	LFO555	555 and 072 gets warm in certain settings
Initial Product Test	LFO	Works well with R311 not mounted
		Pot's should be 1 mm closer to front (or jacks further back)
Initial Product Test	LFO555	Sine and Tri not working - RV101B should have 500R series resistor
Initial Product Test	MMX2	Works nicely
Initial Product Test	NAND	Not working with 4093 - footprint matches 74HC00
Initial Product Test	FlipFlop	Working

Secondary validation

Test	Detail	Status
Product Test	LFO
Product Test	LFO555	not working right
Product Test	MMX2	Working as intended
Product Test	NAND	Will Never work
Product Test	FlipFlop	Working as intended except for LED's
Quality	LFO	Sounds nice - a few constraints on pot's would be nice
Quality	LFO555
Quality	MMX2
Quality	NAND	Will Never work
Quality	FlipFlop
Long Term Product Test
Power Draw

Errata

Errata - LFO555

1 - SW101 too close to P101

Errata - MMX2

1 - 1206 caps (C201+C202) are too close to the switch to mount both

Errata - Flip-Flop

1 - LED positions swapped

Errata - NAND

Will Never work - Footprint wrong so Input is directly coupled to output for some NAND's

Issues and Notes

LFO

1 - 100k should not be mounted (it ruins feedback)

2 - Sine pot should have 2k series resistor

3 - C303 could be 100nF and 1uF addon with a switch for high low

4 - Frequency pot is sensitive at low freq

5 - Chose different Jacks

6 - Consider adding series resistor to outputs

7 - mounting holes

8 - Pot's should be 1 mm closer to front (or jacks further back)

555 LFO

1 - RV101B should have series resistor (330 - 1k)

2 - All outputs should have a series resistor (470R ?)

3 - Pot's should be 1 mm closer to front (or jacks further back)

4 - RV101 footprint not matching pots

Flip-Flop

1 - LED positions swapped

NAND

Will Never work - Footprint wrong so Input is directly coupled to output for some NAND's

Pictures

Inspiration from

https://www.electronics-tutorials.ws/waveforms/555_oscillator.html

http://electro-music.com/forum/topic-31166.html