TC Electronic XII Phaser replacement ICs

All about modern commercial stompbox circuits from Electro Harmonix over MXR, Boss and Ibanez into the nineties.
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Stevenrb718
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Post by Stevenrb718 »

Anybody know of a pin-equivalent replacement for the IC1 in the vintage version of this pedal? 1, 2, & 3 have the numbers scraped, but I believe them to be RC4149s based on random schematics. According to the schematic, it could also be an XR4212 but based on anything I've found that's a 14 pin IC. The one in the pedal I have is 16.

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Jarno
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Post by Jarno »

Was that the quad opamp with off-standard pinout? IIRC it was old but you could do a modern opamp on an adapter board to change the pinout (if there's room for it).
Maybe a place like the electronic goldmine still has them?
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Stevenrb718
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Post by Stevenrb718 »

Jarno wrote: 02 Apr 2024, 07:31 Was that the quad opamp with off-standard pinout? IIRC it was old but you could do a modern opamp on an adapter board to change the pinout (if there's room for it).
Maybe a place like the electronic goldmine still has them?
I can't find any NOS or pulled ICs anywhere. I still haven't found a proper datasheet to find an equivalent or replacement IC.

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Jarno
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my favorite amplifier: Something nice
Completed builds: Alembic-like state-variable and sallen-key filter preamps
Lovepedal Eternity
Phase 100
Brown source
Fuzz Face
Flipster
Alembic F2B (tube preamp)
Opamp and FET buffers
Loads of speakercabinets and ampracks
Busy building a modular synth (ssm2044 vcfs, preamps, ADSR's, VCO's, VCA's)
Tables
Bookshelves
Basses
So many things! :D
Location: Rosmalen, NL
Has thanked: 27 times
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Post by Jarno »

If it is a quad opamp, it might be the same pinout as rc4136, you might try and that looks plausible from tracing part of the pcb, for instance power supply connections, they go to the end if it's a similar pinout, and to the middle if it's the modern pinout.
"It crackles....., but that's ok"

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Tzolov
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Post by Tzolov »

Desolder the chip and look under it both on pcb marking and also the IC , XR were marking chips on the underside too.

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