Omega_ELS Posted October 8 Report Posted October 8 details -> scheme -> psu -> >Max output voltage: 280Vrms It doesn't seem like a very powerful thing. What do you think?
kevin gilmore Posted October 8 Report Posted October 8 (edited) highly similar to hev70 sennheiser amp. and by that i mean n-channel fet as current source into another n-channel fet with grounded gate drive. sennheiser amp single high voltage + 600v. this amp +/-400v (initial guess on current way off) output device is infineon imw120r350m1 which has input capacitance of 3460pf. kind of high. there are better parts to use. like this one. C3M0900170D which has input capacitance of 202 pf. calculated output current is about 12.5ma and about 5 watts per heatsink. going to get fairly hot. mc33078 opamps perform very differently inverting and non-inverting. koss esp950 uses the same part in a very different way. much better ways of doing the unbalanced to balanced conversion. power supply about as basic and cheap as possible. the chinese will do this for less than $500. which means that this is infinitely better than the topping eha5. likely sounds better too. Edited October 8 by kevin gilmore 2
kevin gilmore Posted October 11 Report Posted October 11 it should be noted that with the 1700 volt output stage parts, its real easy to upgrade to +/-600 volt power supplies. going to need a much bigger box with heatsinks on both sides.
kevin gilmore Posted October 17 Report Posted October 17 (edited) moar better. by a fair bit. i'm sure i can find a better cascade part. the battery is a dc to dc converter (4kv isolation rated) and is < $10. with suitable heatsinks bias should be about 25ma. the 30uf things are film caps. nothing i know of is smaller and rated at 1kv. mosfetout.PDF Edited October 17 by kevin gilmore 1
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