DIY500 Compatible Operational Amplifiers

The DIY500 PCB can accept any op amp which conforms to the same physical package and electrical pinout as popularized by the Automated Processes(TM) 2520, and operates on bipolar (+/-) 15 or 16VDC power supplies.

The following discrete and hybrid op amps reportedly meet these requirements.

Component designations J1, C3, R9, etc. refer to the DIY500 schematic, and are printed on the PCB surface.
Short means short circuit. Use zero ohm jumper resistors, or straight wire, such as clipped resistor leads.
N/A means not applicable. Leave that component out.

Photo Brand Model J1 C3 (µF) R9 (Ω) R9a (Ω) C4 (pF) R13 (Ω) R12 (Ω) C7 (pF) R14 (Ω) J2 Can drive an output transformer? Tested? Price (1 piece) Purchase From INFO

ADK ? ? ? ? ? ? ? ? ? ? ? yes NO ? call(?)

Automated Processes (API) 2520 short N/A 100 1M N/A 47 10k 100 47 short yes (75Ω min. load) YES ? used market

Avedis Audio 1122 short N/A short (0) N/A N/A 27 10k 100 47 short yes (75Ω min. load) YES $80 USD direct

BTI OA400 ? ? ? ? ? ? ? ? ? ? ? YES ? used market

Fax Audio FA-100 ? ? ? ? ? ? ? ? ? ? ? YES ? used market

not pictured Forssell Technologies JFET-992 short N/A short (0) N/A N/A 68 10k 33 51 N/A no, short J4 and J5 YES $65 USD direct

Forssell Technologies JFET-993 short N/A short (0) N/A N/A 68 10k 22 51 N/A no, short J4 and J5 NO $80 USD direct

Inward Connections SPA690 ? ? ? ? ? ? ? ? ? ? ? NO N/A not for sale

JLM Audio Hybrid Opamp (kit) short N/A short (0) N/A 220 27 10k 47 51 N/A yes YES ~$20 USD direct

JLM Audio 99V (+/-16V version only!) short N/A short (0) N/A 220 68 10k 47 51 N/A yes YES $54 USD direct

John Hardy Company 990C short N/A short (0) N/A N/A 27 10k 91 39 N/A yes (75Ω min. load) YES $50 USD direct

Photo Brand Model J1 C3 (µF) R9 (Ω) R9a (Ω) C4 (pF) R13 (Ω) R12 (Ω) C7 (pF) R14 (Ω) J2 Can drive an output transformer? Tested? Price (1 piece) Purchase From INFO

not pictured Little Labs The Discreet Opamp ? ? ? ? ? ? ? ? ? ? ? NO ? call(?)

Modular Audio Products (MAP) 5002 ? ? ? ? ? ? ? ? ? ? ? NO ? used market

Modular Audio Products (MAP) 5003 ? ? ? ? ? ? ? ? ? ? ? YES ? used market

Melcor Electronics 1731 short N/A 100 N/A N/A 47 10k 100 47 short yes YES ? used market

not pictured Millennia Media MM-99 ? ? ? ? ? ? ? ? ? ? no, short J4 and J5 NO $75 USD dealers or direct

Millennia Media MM-990 short N/A short (0) N/A N/A 68 10k 33 51 N/A no, short J4 and J5 YES ? used market

Old School Audio ? ? ? ? ? ? ? ? ? ? ? yes NO N/A not for sale

ProTech Audio Model 1000 ? ? ? ? ? ? ? ? ? ? ? YES ? call(?)

Purple Audio KDJ 3 N/A 4.7 100 100k N/A 30 10k 68 51 N/A no, short J4 and J5 YES $45 USD direct

Purple Audio KDJ 4 N/A 1 100 100k N/A 30 13k 68 68 N/A yes YES $65 USD direct

RCA Operational Amplifier ? ? ? ? ? ? ? ? ? ? yes YES ? used market

Seventh Circle Audio SC25 short N/A short (0) N/A N/A 27 10k 100 47 short yes YES $75 USD direct

Scott Liebers' SL-2520 short N/A 100 N/A N/A 47 10k 100 47 short yes NO $70 USD Tangible Technology

Sound Skulptor SK25 short N/A 100 N/A N/A 47 10k 100 47 N/A yes NO $74 USD direct

Sound Skulptor SK99 ? ? ? ? ? ? ? ? ? ? ? NO $74 USD direct

Sound Skulptor SK47 ? ? ? ? ? ? ? ? ? ? ? NO $74 USD direct

TOA PC-2011 ? ? ? ? ? ? ? ? ? ? ? NO ? used market

Yamaha NE-80100 short? N/A? short 100k N/A 51 10k 100 51 N/A yes YES ? used market

Yamaha NE-80200 short? N/A? 100 100k N/A 51 10k 100 51 N/A yes YES ? used market

Photo Brand Model J1 C3 (µF) R9 (Ω) R9a (Ω) C4 (pF) R13 (Ω) R12 (Ω) C7 (pF) R14 (Ω) J2 Can drive an output transformer? Tested? Price (1 piece) Purchase From INFO

Specifications subject to change without notice. GMT