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Analog Line Level Preamplifiers , Passive Pre-amps, Crossovers, etc.

preamp regulated or unregulated 4558d
preamp regulated or unregulated 4558d
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Old 1st January 2018, 05:15 PM   #1
rahulrahullll is offline rahulrahullll
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Default preamp regulated or unregulated 4558d

i have tda 2050 stereo made by me—working fine no noise——i buyed–a–tone control board bass,mid,treb,vol–2 ic —–4558d—-

power supply separate is for tone board—
9-0-9 v ac after bridge rectify—-12-0-12 v dc power given to tone board—-in board written d c—-( + – gr)

actually amp trannsformer 22-0–22=44 v dc so i cannot use in preamp

--------https://ibb.co/bHm1pw----------

vol pot–47k, bass treble mid–100k



connections———–amp is grounded to amp transformer ————

signal grounded to tone board transformer——–tried grounding too amp transformer—-no result———in the pic———–+-g is supplied by 12-0-12 v dc from unregulated supply using transformer-bridge-caps———

input—–is given from pc out–input is grounded to gr of power—-output connected to amp input



observations—-

1——-when i connect tone board—sound ok but huge constant background noise also when pause song huge background noise when signal cable open——–noise stiill there —-noise decreases if vol is turned down-----

2———weird thing in tone board—vol increases if i turn anticlock direction, all other pots increase anticlock direction

3——–when i turn off power to tone board with amp on no noise

4—–in board power ground, input,output,vol pot same ground

5—–in input of tone board 150 k ohm there—output 10k

6————-tried star grouunding for amp,signal,tone—–noise there

7---------does preamp needs regulated or unregulated power



——–what should i try to resolve issue ?

———–thank you

Last edited by rahulrahullll; 1st January 2018 at 05:37 PM.
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Old 1st January 2018, 10:11 PM   #2
PRR is offline PRR  United States
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The 4558 is not terribly fussy and can be fed unregulated power if it is well filtered.

Is "noise" hiss, hum, buzz, radio?

The backward volume knob action may be mis-wiring of the board or even a bad board.
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Old 2nd January 2018, 08:31 AM   #3
rahulrahullll is offline rahulrahullll
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noise i guess is hum---like--------goooooooooooo
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Old 3rd January 2018, 10:13 AM   #4
AndrewT is offline AndrewT  Scotland
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Quote:
Originally Posted by rahulrahullll View Post
......................what should i try to resolve issue ?
.............
Post a schematic and some detailed pics of what you have built.
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regards Andrew T.
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Old 3rd January 2018, 07:55 PM   #5
rahulrahullll is offline rahulrahullll
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