|
Home | Forums | Rules | Articles | diyAudio Store | Blogs | Gallery | Wiki | Register | Donations | FAQ | Calendar | Search | Today's Posts | Mark Forums Read | Search |
Analog Line Level Preamplifiers , Passive Pre-amps, Crossovers, etc. |
|
Please consider donating to help us continue to serve you.
Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving |
![]() |
|
Thread Tools | Search this Thread |
![]() |
#1 |
diyAudio Member
Join Date: Dec 2014
|
![]()
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 04:37 PM. |
![]() |
![]() |
#2 |
diyAudio Member
Join Date: Jun 2003
Location: Maine USA
|
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. |
![]() |
![]() |
#3 |
diyAudio Member
Join Date: Dec 2014
|
noise i guess is hum---like--------goooooooooooo
|
![]() |
![]() |
#4 |
R.I.P.
Join Date: Jul 2004
Location: Scottish Borders
|
Post a schematic and some detailed pics of what you have built.
__________________
regards Andrew T. |
![]() |
![]() |
#5 |
diyAudio Member
Join Date: Dec 2014
|
|
![]() |
![]() |
Thread Tools | Search this Thread |
|
|
![]() |
||||
Thread | Thread Starter | Forum | Replies | Last Post |
tda2050 max voltage regulated or unregulated | rahulrahullll | Chip Amps | 9 | 9th December 2017 08:35 PM |
Regulated Vs Unregulated chipamp power supply sound | darklife | Chip Amps | 52 | 3rd July 2016 08:05 PM |
4558d | auto pilot | Analog Line Level | 4 | 7th January 2013 07:42 PM |
regulated or unregulated amp | anton | Car Audio | 7 | 1st July 2006 09:06 PM |
New To Site? | Need Help? |