Yusynth ARP 4072

It was my first DIY Build - so sorry for the building quality

added a second DIY project 2014 with better quality..

Attention: for bridechamber pcb (SA798) version, the output is wrong. correct:GND to TIP, Signal to GND

BOM parts..

4 x 47k Linear Poti für others (freq, Resonance etc) banzai Alpha 16mm FS 50k lin

2 x 47k Log Poti für Input Level banzai Alpha 16mm FS 50k log

6 x knobs

6 x female 6,3mm mono (switchcraft 112AX or equal.)

pinheaders/connectors or hard wire linking to frontpanel

Building details

Japanese dual transistors version

reference	value	quantity
U1	LM3900N	1
U2	TL074	1
Q1 to Q6 or Q1 to Q12	2SA798 either 2N3906 or BC557 matched by pairs (caution the pin out is different, see layouts above)	6 or 12
R1,R2	10 ohms 5% - or 2x ferrite (better)	2
R8,R10,R11,R15,R16,R20,R21,R25,R26	220 ohms * matched to 1% 5% otherwise	9
R7,R9,R14,R19,R24,R42,R46	1k * matched to 1% 5% otherwise	7
R12,R13,R17,R18,R22,R23,R27,R28, R29,R35,R36,R37,R38,R43	10k * matched to 1% 5% otherwise	14
R44	15k 5%	1
R40,R41	27k 5%	2
R45	33k 5%	1
R3,R4,R5,R6,R30,R31,R32,R34,R39	100k 5%	9
R33	150k	1
C3,C4,C5,C6	470p matched to 1% ( i use Glimmercaps they have 2%)	4
C7,C8	100n	2
C1,C2,C9,C10	22µF 35V	4
T2	2k2 10 turns trimmer 3296w series for bridechamber pcb, otherwise Y	1
T1	47k 10 turns trimmer 3296w series for bridechamber pcb, otherwise Y	1
P1,P2	47k log potentiometer	2
P13,P4,P5,P6 (see latest entry)	47k lin potentiomter	4
Jk1,Jk2,Jk3,Jk4,Jk5,Jk6	female jack sockets	6
DUAL GANG POT for Resonance (bleed thru fix)	dual 47K linear	1

2k2 trimmer

Reichelt Parts ohne Frontplatten poti etc:

LM 3900 DIL	Amplifier, DIL-14
TL 074 DIL	Op-Amp, DIL-14
TL 072 DIP	Op-Amp, DIP-8
METALL 220	Metallschichtwiderstand 220 Ohm
METALL 1,00K	Metallschichtwiderstand 1,00 K-Ohm
METALL 10,0K	Metallschichtwiderstand 10,0 K-Ohm
METALL 15,0K	Metallschichtwiderstand 15,0 K-Ohm
METALL 27,0K	Metallschichtwiderstand 27,0 K-Ohm
METALL 33,0K	Metallschichtwiderstand 33,0 K-Ohm
METALL 100K	Metallschichtwiderstand 100 K-Ohm
METALL 150K	Metallschichtwiderstand 150 K-Ohm
470p Glimmer	http://www.reichelt.de/CY-22-3-470P/3/index.html?&ACTION=3&LA=446&ARTICLE=42437&artnr=CY+22-3+470P&SEARCH=470p
100N poly or c0g	C0G or polyester
22uF electrolyt cap	elekrolyt kondensator
64Y-50K	http://www.reichelt.de/64Y-50K/3/index.html?&ACTION=3&LA=446&ARTICLE=2727&artnr=64Y-50K&SEARCH=64Y-50K for bridechamber pcb use 64W-50K
64Y-2K	http://www.reichelt.de/64Y-50K/3/index.html?ACTION=3;ARTICLE=2717;SEARCH=64Y-2,0K for bridechamber pcb use 64W-2,0K http://www.reichelt.de/index.html?ACTION=3;ARTICLE=2700;SEARCH=64W-2,0K
2x Ferrite instead of 2x 10R

Bleed through FIX (high esonance and tracking is better too)

this means unsolder the left leg of R43, solder a wire this leg and connect this wire to the wiper lug of the second potentiometer of the dual-gang pot.

Schematic from Yusynth