Well, here it is:
http://www.darkmatter.myby.co.uk/cascodevas.png
(I didn't make it an image as it's huge - LTSpice looks nasty at smaller resolutions)
I've never really designed an amplifier before, and haven't had a lot to go on, just some articles on the internet, looking at lots of designs, and tinkering in SPICE, so I'm looking for some expert opinions here.
A few points:
* 2SC2240/2SA970 will most likely be replaced with 2SC2547E/2SA1085E instead as they are lower noise. 2N5401/2N5551 will probably be used for early testing as they are cheap!
* BD139/140 are on the edge of their ratings, I will hopefully use 2SC2911/2SA1209 instead.
* MJL21193/MJL21194 will probably be changed for MJL4281/MJL4302 - I didn't use the SPICE models for those as they are apparently wrong.
One question I do have, there is a large turn-on thump due to the current sources in the input LTP's... is there any way I can calm this down as it takes about 2 seconds to settle according to the simulator.
It's designed for 100W at 8 ohms with a 1V RMS input (gain 30.46dB)
http://www.darkmatter.myby.co.uk/cascodevas.png
(I didn't make it an image as it's huge - LTSpice looks nasty at smaller resolutions)
I've never really designed an amplifier before, and haven't had a lot to go on, just some articles on the internet, looking at lots of designs, and tinkering in SPICE, so I'm looking for some expert opinions here.
A few points:
* 2SC2240/2SA970 will most likely be replaced with 2SC2547E/2SA1085E instead as they are lower noise. 2N5401/2N5551 will probably be used for early testing as they are cheap!
* BD139/140 are on the edge of their ratings, I will hopefully use 2SC2911/2SA1209 instead.
* MJL21193/MJL21194 will probably be changed for MJL4281/MJL4302 - I didn't use the SPICE models for those as they are apparently wrong.
One question I do have, there is a large turn-on thump due to the current sources in the input LTP's... is there any way I can calm this down as it takes about 2 seconds to settle according to the simulator.
It's designed for 100W at 8 ohms with a 1V RMS input (gain 30.46dB)