The Quest for >2000 Vppss

[kevin gilmore]

q12 is the current limit. so if the amp board shorts, at least the power supply will not explode.

what do you want me to replace the pzta part with?  remember 20+ma

Edited Tuesday at 09:38 PM by kevin gilmore

[simmconn]

I was just pointing out, as how Q12 is connected today, it’s not doing what it is supposed to do. The output should be connected to gate instead.

I remember last time you recommended TTC004B as a replacement for the PZTA42 (different package). We just need something with a flat hfe-Ic curve to, say >100ma at VCE=10V.

[JoaMat]

Seems simmconn reads shematics. Regarding Q12, schematics and gerbers don't match, I think.

[kevin gilmore]

power supply schematic updated. amp board updated.

circlotronpsupdated.pdf

 

kgsshvcarbonv6.1c3cs - CADCAM.ZIP

Edited Wednesday at 10:35 AM by kevin gilmore

[Michelag]

Wow!

But just for my understanding, this is the limit after which damage to earspeakers can occur, right? 

I mean, so much power is really needed to drive the most demanding e-stats? 

Or is it thought as an exercise of pushing it to the boundaries ?

 

[kevin gilmore]

max voltage swing is 4 x bias.  so 580 x 4.  the amp does loose about 20 volts of voltage swing, so 600 is a nice number. same voltage the koss uses. also the rating on the pnp transistor.  could cut the voltage to 550v for a bit more margin.

 

[psyduck]

Though running it close to max bias will probably damage your hearing.

[kevin gilmore]

surprisingly on something like a 727, the peaks are already clipped at moderate volumes.  so this will let all the wonderful dynamics thru.

and damaging you hearing, definitely.