Buffered amplifier question ! (2134, 3886)

[-_nando-_]

Hello !

I built a BPA "200" (parallel + bridge, 4 3886s), but I'm running it stereo eheheh, so, two BPA100 I'm using a OPA2134 (dual opamp) as buffer, a half for each BPA100 (two 3886 bridged). The opamp output is connected to BPA100 imput with 100R resistor + 2uF poliester (2x 1uF) cap, with a 100K resistor to the ground after the capacitor.


To turn it in a BPA200, I have to parallel the bridges outputs (out 1 and out 2), no problem, and have the same signal entering in both bridges. My question is, can I join the inputs of the bridges? This will "short" the buffers outputs, any problems?!


My idea is, have a stereo input and a mono output (mono/ST switch on the amp), so I can use it as a BPA200 with only one 4Ohms speaker, using the full power of the amp.


So, having a stereo input (one channel for each buffer), if I "short" the buffers outputs (after the 2uF and 100R resistor), will the buffer burn!? If the answer is yes, what resistor should I use (instead the 100R) to do it? Am I obligated to have a mono imput to avoid buffers fight each other??



When I arrive at home, I'll post the pic of the amp, it's getting very nice !



Cheers !

[-_nando-_]

Nobody wants to help me !





Having a feedback would be nice !


The Photo !

Note that I used Coaxial Cables, noise is zero !

[jaudio]

Why short it,when you can just disconnect one of the buffers output with a dpdt switch? I cant see a problem if it is not connected

[-_nando-_]

DONE hahahahaahah....


600R resistors on each channel of input, and the switch short the inputs (L/R) after the resistors, to don't furck the source, and also sorts the buffers outputs, that have no problem because they're delivering the same signal, it's just an offset precaution (diferents offsets might cause problems on parallel + bridge configuration).





Now I'm listening Stan Getz for Lovers, track 14 on stereo mode, using a pair of JBLs E60, drinking germania beer.