tonyo@tekred.CNA.TEK.COM (Tony Ozrelic) (02/21/91)
Instead of trying to drive the output of the car radio amplifiers, try
this: grab the preamp inputs at the volume control and feed your audio in
from there. Now you can change the volume by tweaking the radio's control,
instead of the Walkman's. Works for any radio. Obligatory Bad Schematic:
---- radio audio -----* switch (either manual or in the jack)
____________
---- walkman audio----* / |
|
|
/
\
/<------- to preamp ------
\
/ radio volume control
|
|
gnd
tony "bash to fit, file to hide, paint to cover" o.brendan@otc.otca.oz (Brendan Jones) (02/22/91)
in article <7116@tekred.CNA.TEK.COM>, tonyo@tekred.CNA.TEK.COM (Tony Ozrelic) says: > Instead of trying to drive the output of the car radio amplifiers, try > this: grab the preamp inputs at the volume control and feed your audio in > from there. Now you can change the volume by tweaking the radio's control, > instead of the Walkman's. Works for any radio. Obligatory Bad Schematic: True, but without a circuit diagram and an easy-to-get-to PCB in the radio, it may be difficult to do this. Certainly the PCB in my radio wasn't designed to be got at (mechanically or electrically!). Output stages are usually separate, hence easier to get at. Actually, with my scheme the radio volume knob *does* adjust the Walkman sound level as turning up the radio volume pot reduces the resistive divide-by ratio I used to cut down the Walkman signal level. Not as neat, but still effective. -- Brendan Jones | ACSnet: brendan@otc.otca.oz.au | What does R&D Contractor | UUCP: {uunet,mcvax}!otc.otca.oz.au!brendan | your Services R&D | Phone: (02)2873128 Fax: (02)2873299 | company |||| OTC || | Snail: GPO Box 7000 Sydney 2001, AUSTRALIA | export?