DC Audio 20K

[caraudioguy2100]

Amp came in with blown outputs .

Anyone have any idea what the 2 ic’s are on the driverboard ?

 

[Perry Babin]

DIP = IRS2184

SOIC = TL072 Confirm that neither SOIC IC reads 0 ohms between terminals 1 and 4.

 

[mnhiphop101]

The top one is a lm311

 

[mnhiphop101]

The tc4452 transistors almost always need replacing if the outputs blow.

 

[Perry Babin]

Re #3:

That's what the 1-4 check is for. Some of these boards (SOIC, DIP) have one LMx11 and one op-amp. The ones with no 1-4 short have two op-amps.

 

[mnhiphop101]

It looks very similar to the vfl 22k im working on. However the vfl only has 1 driver card. Looks like that one has 2.

 

[mnhiphop101]

I was unaware that there are versions with 2 tl072's. Every other component and value i can see in his pic matches mine identically. Im almost certain pins 1 and 4 of the top chip will be shorted.

 

[Perry Babin]

There similar boards. One has a DIP driver IC. The other has an SOIC driver IC. I don't know how many versions of the basic design are being used so I use the 1-4 short test to know definitively if one of the SOIC ICs (not the driver) is an LMx11.

 

[DanFS722]

Crescendo BC-17k and Crossfire XS-16K is the same as well, if that helps or not.

 

[caraudioguy2100]

The top ic pins 1-4 are shorted together

 

[Perry Babin]

That's an LMx11.