This was a request. Appearantly a very powerful booster and eq circuit using inductors for sort of multiband wah sounds. The original ran on two 9v batteries for bipolar power operation but I included an onboard power inverter. Note that sizes of inductors varies a lot but hopefully there is enough room for them, especially the larger ones.
Schematic by Dirk Hendrik HERE.
And a layout with more accessible 100mH inductors.
Incredibly fast! Awesome, thank you!
ReplyDelete... May I gently ask for another favour? :)
ReplyDeleteI find this eq already very loud and efficient at boosting treble, so I never use the onboard "boost" and "treble boost" features...
Do you think it would be possible to make a "redux" version, featuring only the eq section (with the "boost" and "high boost" sections)?
Thank you again for releasing this layout!
Do you mean having both boost switches hardwired at "Off" position?
DeleteI don't know if it is doable, I have to check the schematic again...
Yes, that's it, just skipping both "boost" and "hi boost", and making the circuit even simpler (with only the eq section).
DeleteHello,
ReplyDeleteI have made a table displaying the various inductor / capacitor => frequency combinations.
You get both :
- The stock values
- Values measured on other units (they sometimes differ greatly than the stock values!)
- how to reach stock values using 100mH inductors (which are easier to find than 470 or 500mH inductors).
grab it here :https://i.imgur.com/idU6Fu3.png
Good job! Tried to locate 500mH inductors without any luck (except for bulky wah inductors...) so your table is most welcome. I guess the 220ohm resistors can be omitted then?
DeleteAs for removing the boost switches: I'm not completely confident how the circuit works but I think the FET stage has to stay since it it seem to affect the op amp part in both switch positions for the "High Boost" switch. And I'm not 100% sure about "Boost" switch...but my guess is that the 160ohm/160ohm junction should connect to 1,5k that connect to pin 5 of the op amp?
I might be slow on the blog from now on since today I'm off on my vacation...
Hi,
DeleteYou're welcome for sharing the table.
If removing the boost and high boost sections are tricky or prone to errors, let's keep it there :)
Enjoy your vacations!
KG, thanks for the list of substitutions, but does the "Q" or width of the bands stay the same? Will it sound just like the original, but with easier to source parts?
DeleteHi, Alex,
DeleteGood question, I couldn't tell for sure...these are information I gathered from elsewhere (and I can't remember the source)...
Layout with 100mH inductors added.
DeleteThank you, Fuzzhead!
Deletewhere can i find the schematic of the No. 95 Renometer
Deletehttps://www.dirk-hendrik.com/temp/ibanez_renometer.pdf
DeleteAwesome pedal, best EQ booster ever, already have one and now i can clone it to act in stereo!
Delete