Chip Amp Photo Gallery

[6L6]

PG+ and PG- are connected at the amp PCB. It's how the circuit board is designed.

 

[lanchile]

PG+ and PG- are connected at the amp PCB. It's how the circuit board is designed.

Connections from PG- and PG+ go to "power supply caps + and -"... that go to ground!

I am right here? let see the picture here:

 

[Einric]

P/S & Amp Schematics

Here are the schematics for the P/S and the Amp.
Hopefully this sheds a little light on the subject.

 

[Einric]

The difference in the two power supplies is that the Audiosector P/S has reversed diode polarity on the AC1 in relation to the AC2.

 

[6L6]

The difference in the two power supplies is that the Audiosector P/S has reversed diode polarity on the AC1 in relation to the AC2.

Electrically they are the same. The Audiosector schematic is drawn a bit non-standard.

 

[danzrose]

lm1875 "Unyil"

My LM1875 Amp with simple PSU

 

[benb]

Electrically they are the same. The Audiosector schematic is drawn a bit non-standard.

Look carefully at thr bridges in #2282 - the lower bridge will charge the lower electrolytic with the WRONG polarity.

Is there a policy here about non-photographic discussions in this thread? Should someone start another thread?

 

[Einric]

@ Dan where are your little chips hiding?

 

[6L6]

Look carefully at thr bridges in #2282 - the lower bridge will charge the lower electrolytic with the WRONG polarity.

Yes, you are absolutely correct! Good catch!

 

[AndrewT]

The Audiosector schematic is correct.
The +ve of the smoothing capacitor in both the upper and the lower halves is connected to the +ve of the bridge rectifier.

 

[regiregi22]

Connections from PG- and PG+ go to "power supply caps + and -"... that go to ground!

I am right here? let see the picture here:

Where did you get this wrongly drawn sch? I suggest you to remove it, as if build as shown if will probably make explode a 10.000uF capacitor, which is nothing fun for sure!

 

[AndrewT]

Reg,
which post and which schematic are you referring to?

 

[deadhead]

Reg,
which post and which schematic are you referring to?

Post 2282 still being misquoted I think.

 

[JMFahey]

Don't know which one is called "audiosector" but the drawing in post #2282 is wrong.

 

[Einric]

The Audiosector P/S is in post #2283

 

[dewets]

Guys!!!! THIS IS THE PHOTO GALLERY....

Please take your technical discusions to the appropriate sub-forum...

 

[AndrewT]

safety issues over-rule all else.

 

[regiregi22]

Reg,
which post and which schematic are you referring to?

Post 2282. Look at the bottom half, positive side of the diode bridge is going to negative side of smooth cap. Negative side is connected to capacitor positive pole.

Safety first, sirs.

 

[mhouston]

Looks wrong to me.

 

[submaster]

TDA 7293, my first amp

Case - steel, full hand made, front panel - aluminium 5mm, tda 7293