Which buffer do you like?

[jimilee]

Looks good


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[midwayfair]

Which makes me wonder why he used so many parts to do what an op amp can do with half the parts?

I think it might be old enough to simply say "op amp chips sucked and were expensive at the time."

[culturejam]

I think it might be old enough to simply say "op amp chips sucked and were expensive at the time."

I thought of that, but he didn't start selling pedals until the late 70s, and op amps had been widely available for 20 years at that point. But I guess there is a lot of value in designing around parts you are very familiar with, especially if they are cheaper.

[samhay]

^
FET input op-amps (much better for high input impedance) came along in the mid-late '70s and would have been relatively expensive, so the cost argument makes some sense.
BJTs are also more tolerant of input abuse (e.g. through ESD) and as Cornish was making kit for touring musicians, he may have figured they were more likely to survive a tour of stadium rock. This is actually still a valid reason to choose a BJT as the input buffer to your pedal board.

[culturejam]

^
FET input op-amps (much better for high input impedance) came along in the mid-late '70s and would have been relatively expensive, so the cost argument makes some sense.
BJTs are also more tolerant of input abuse (e.g. through ESD) and as Cornish was making kit for touring musicians, he may have figured they were more likely to survive a tour of stadium rock. This is actually still a valid reason to choose a BJT as the input buffer to your pedal board.

Both very good points!

[jubal81]

Didn't end up too awful big. 50mm X 36mm.


Now about a name?
Bottom Muscle
Iron Glutes
Lightning Eel


It's your's Jimi, name it what you want.

[jimilee]

Thank you!!


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[jubal81]

Shared on OSH


Order it here

[culturejam]

How about "Signal Lube"?

[jimilee]

How about "Signal Lube"?

Carlos Danger, I like that.

[Willybomb]

Oooh, buffer with charge pump... handy.  Is the buffer in the chain regardless of bypass?

[jubal81]

Oooh, buffer with charge pump... handy.  Is the buffer in the chain regardless of bypass?

Nope. The switch bypasses the buffer.