258D

About the 258D PCB

258D is an open source PCB design by DunningtonAudio, published on GitHub under the GPL-3.0 license. It is a 2-layer board measuring 104 × 158 mm, with 219 components from 66 distinct parts.

Other key parts include the ADR01, TL071, TL074, LM13700 and TL072. By type, the board carries 106 resistors, 34 capacitors, 25 connectors, 10 ICs, 10 transistors and 6 inductors.

From the project

A dual oscillator project

The 258D Dual Oscillator is designed to replicate the functionality of the Buchla 258C module using modern construction techniques and readily available parts. Like Mark Verbos’ 258V and Dustin Stroh’s 258J, the 258D uses the exponential converter and triangle core from the Electronotes VCO option 3, designed by Bernie Hutchins, with output waveshaping derived from Don Buchla’s original 258 Design.

Main components on the 258D

ADR01 TL071 TL074 LM13700 TL072

258D bill of materials (BOM)

219 components, 66 distinct parts.

Qty	Part	Footprint	Refs
1	ADR01	SOIC-8_3.9x4.9mm_P1.27mm	U1
3	TL071	SOIC-8_3.9x4.9mm_P1.27mm	U2, U104, U204
2	TL074	SOIC-14_3.9x8.7mm_P1.27mm	U101, U201
2	LM13700	SOIC-16_3.9x9.9mm_P1.27mm	U102, U202
2	TL072	SOIC-8_3.9x4.9mm_P1.27mm	U103, U203
1	Mod_Indicator_1-10_150mil	Mod_Indicator_1-10_150mil	M2
1	Serial_Box_150mil	Serial_Box_150mil	M3
2	DMMT3906W	SOT-363_SC-70-6	Q101, Q201
2	DMMT3904W	SOT-363_SC-70-6	Q102, Q202
2	MMBT3906	SOT-23	Q103, Q203
2	MMBF5485	SOT-23	Q104, Q204
2	MMBFJ201	SOT-23	Q105, Q205
1	+15V	SolderWirePad_single_1-2mmDrill	J1
1	0V	SolderWirePad_single_1-2mmDrill	J2
1	-15V	SolderWirePad_single_1-2mmDrill	J3
2	Vary CV 1	Johnson_108-09XX-001	J101, J201
2	Vary CV 2	Johnson_108-09XX-001	J102, J202
2	V/O	Johnson_108-09XX-001	J103, J203
2	FM IN	Switchcraft_41	J104, J204
2	Shape CV	Johnson_108-09XX-001	J105, J205

Show 46 more

Qty	Part	Footprint	Refs
2	SHAPE SEL 1	PinHeader_1x03_P2.54mm_Vertical	J106, J206
2	SHAPE SEL 3	PinHeader_1x03_P2.54mm_Vertical	J107, J207
2	SHAPE SEL 2	PinHeader_1x03_P2.54mm_Vertical	J108, J208
2	Triangle Out	Switchcraft_41	J109, J209
2	Final Out 1	Switchcraft_41	J110, J210
2	Final Out 2	Switchcraft_41	J111, J211
4	100k	Potentiometer_Bourns_3314J_Vertical	TR101, TR102, TR201, TR202
2	100R	Potentiometer_Bourns_3314J_Vertical	TR103, TR203
2	20k	Potentiometer_Bourns_3314J_Vertical	TR104, TR204
2	1M	Potentiometer_Bourns_3314J_Vertical	TR105, TR205
8	100kB	RV16AF-41-(L)R1-XXX	VR101, VR103, VR104, VR106, VR201, VR203, VR204, VR206
2	100kB	RD901F-40-00D	VR102, VR202
2	100kA	RV16AF-41-(L)R1-XXX	VR105, VR205
4	BAW56	SOT-23	D101, D102, D201, D202
6	10u	L_0805_2012Metric	L1, L2, L101, L102, L201, L202
20	100n	C_0805_2012Metric	C1, C2, C3, C4, C106, C107, C108, C109 +12
2	2n2	C_0805_2012Metric	C101, C201
6	22uF	CP_Elec_5x5.8	C102, C114, C115, C202, C214, C215
2	100p	C_0805_2012Metric	C103, C203
4	220p	C_0805_2012Metric	C104, C105, C204, C205
10	10k	R_0805_2012Metric	R1, R2, R106, R109, R115, R122, R206, R209 +2
4	180k	R_0805_2012Metric	R101, R102, R201, R202
6	150k	R_0805_2012Metric	R103, R123, R128, R203, R223, R228
2	2M7	R_0805_2012Metric	R104, R204
2	120k	R_0805_2012Metric	R105, R205
6	100k	R_0805_2012Metric	R107, R111, R113, R207, R211, R213
4	1M5	R_0805_2012Metric	R108, R110, R208, R210
4	390k	R_0805_2012Metric	R112, R132, R212, R232
4	1k8	R_0805_2012Metric	R114, R145, R214, R245
2	2k	R_0805_2012Metric	R116, R216
2	390R	R_0805_2012Metric	R117, R217
4	33k	R_0805_2012Metric	R118, R144, R218, R244
2	4k99	R_0805_2012Metric	R119, R219
4	68k	R_0805_2012Metric	R120, R126, R220, R226
6	15k	R_0805_2012Metric	R121, R125, R130, R221, R225, R230
4	3k3	R_0805_2012Metric	R124, R149, R224, R249
2	680k	R_0805_2012Metric	R127, R227
6	6k8	R_0805_2012Metric	R129, R142, R143, R229, R242, R243
4	820k	R_0805_2012Metric	R131, R136, R231, R236
2	2k49	R_0805_2012Metric	R133, R233
8	330k	R_0805_2012Metric	R134, R137, R138, R139, R234, R237, R238, R239
2	430k	R_0805_2012Metric	R135, R235
10	680R	R_0805_2012Metric	R140, R141, R148, R151, R152, R240, R241, R248 +2
2	470R	R_0805_2012Metric	R146, R246
2	2k2	R_0805_2012Metric	R147, R247
2	9k1	R_0805_2012Metric	R150, R250

258D design files

The KiCad project lives in the DunningtonAudio/258D repository on GitHub; these links point at the commit this page was built from.

Layout258D.kicad_pcb

258D: common questions

How big is the 258D PCB?

The 258D measures 104 × 158 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the 258D?

219 components, from 66 distinct parts. The full bill of materials is listed on this page.

Where can I download the 258D design files?

From the DunningtonAudio/258D repository on GitHub, which has the KiCad layout; the links under Design files point to each one.

Can I use the 258D design in my own project?

Yes, under the terms of its GPL-3.0 license, which DunningtonAudio chose for the repository.