[Builder Brad]

 

[Builder Brad]

i have found a source of 330va transformers with 0-110, 0-110-130 primaries and 0-15, 0-15 secondaries that cannot be beaten-there is limited stock and i will be making some compromises, but they are only £10 each. I intend to use the 2 x 110v primaries and should get around 15.5v AC and around 22v at the rails - the question is if this is enough for the chip amp with 8 ohm low sensitivity speakers.

Brad

[Gordy]

2-3 years ago I ran some 3886 amps using 24v battery supplies/13.6KuF driving 86dB speakers in a 16' x 16' room and, though they were okay at relatively low volume (70-75dB), they quickly ran out of steam above that. IIRC, I calculated wattage to be around 28-30w.  Might be okay if you run them bridged though.... in a smallish room?  The 3886's really need about 32-38 volts to be happy and I ended up using 300/25v Avel(s).

PS, if you do bridge them, you must run 8ohm or greater loads!

[Builder Brad]

cheers Gordy,

that really helps me out, compromise not worth the negative. these speakers are outside and have worked well in the past with 300 watt mosfet amp modules-these are now powering a couple of clarke synthesis tactile transducers, and i am hoping for good results from the chipamps.   


i think that i will look for transformers  with 28-30 2ndaries.

did you have ASKA amps at one point?

Brad

[Gordy]

Yes, that would be me, a 55n and the bits to upgrade to +, still have it! 

i think that i will look for transformers  with 28-30 2ndaries.

I was just looking about, you might want to check the data sheet, seems 35v rails is the highest I've found quoted for the 3886!

Gordy