discrete operational amplifiers
we have developed several fully discrete operational amplifier flavors in the 2520/990 footprint, some original and some adaptations or inspired on legacy iconic designs
OpAmp comparison table
Name | Description | Design Remarks | Sound | Transistors | Operating Voltage |
|---|---|---|---|---|---|
M2 | original design inspired by Melcor 1731 output stage | cascode amplification stage with quasi-complementary output | clean, warm, solid | 11 | ±12V to ±24V |
flick | original inspired by Flickinger 290-3 mic pre cards | differential amplification followed by all NPN output | open top with rich harmonics | 6 | ±15V to ±24V |
ADOA | our take on the most famous American discrete op amp | differential amplification with complementary output | edgy highs and punchy mids | 8 | ±12V to ±20V |
JDOA | adaptation of Jensen 918 | darlington amplification stage with complementary output | nice low end and openess | 9 | ±15V to ±24V |
NDOA | adaptation of highly configurable German design | common emitter amplification stage with complementary out | thick warm sound | 12 | ±2.5 to ±22V |
QDOA | adaptation of a classic American op amp used in southern California large format consoles | novel gain stage with complementary out | gentlemanly sound | 10 | ±14 to ±28V |
M2
clean
warm
solid
ADOA
edgy highs
punchy mids
NDOA
thick
warm
sound
flick
open top
rich harmonics
JDOA
nice low end
openess
QDOA
gentlemanly
sound