I have a few old walkmans that I'd like to use with guitar as headphone amps which are practical to use because of 3V supply but guitar signal level is to high and IC's input impedance is low and unsuited for guitar so I want to put some buffer circuit made of bipolar or fet transistors in between. It has to be on 3V also. Does any one has suggestion of such circuit?
I made the circuit, the thing is walkman's amplifier input ground isn't supply ground. How should I solve that?
Does the walkman circuit have a negative ground (battery minus connected to the input common)?
Or does it have a positive ground (battery plus connected to the input common)?
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> Does the walkman circuit have
It turns out there were MANY WalkMan circuits, from the original basic to some much more complicated designs. I never knew that the later ones (MEGAbass) had the headphone shell at +1.3V from power common, and a third power amp to drive it. This one's schematic is mind-blowingly complex-- so much that -I- would forget about it and just whomp-up one of the now-common 3V headphone chips with a buffer in front.
It turns out there were MANY WalkMan circuits, from the original basic to some much more complicated designs. I never knew that the later ones (MEGAbass) had the headphone shell at +1.3V from power common, and a third power amp to drive it. This one's schematic is mind-blowingly complex-- so much that -I- would forget about it and just whomp-up one of the now-common 3V headphone chips with a buffer in front.
No.
It's pretty wacky ("Sony-clever"), and I burned-out reading bad scans last night. Since I bet Sony changed the scheme every few models, let Vasco say what specific model.
It's pretty wacky ("Sony-clever"), and I burned-out reading bad scans last night. Since I bet Sony changed the scheme every few models, let Vasco say what specific model.
Try a series 100k-1M resistor between the guitar and the walkman (maybe a 1M pot).
Adjust the resistor value for just enough gain at the full volume walkman setting.
This assumes that the walkman's input impedance is on the order of 10k or so.
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