DPA-222 - The Bipolar Power Amplifier
Click on the picture to get a larger view.
Click on the picture to get a larger view.
DPA222SE-Material_Eng.sxc OpenOffice file
This is a power amp with bipolar transistors as output devices.
Some technical data:
120 W / 4, 70 W / 8
SNR more than 118 dB
fr. 20 - 200 kHz,
dist. below 0,01 %
SR more than 50 V / microsec.
DPA-380 - The MOSFET Power Amplifier
Click on the picture to get a larger view.
Click on the picture to get a larger view.
This is a power amp with MOSFET's transistors as output devices. The pdf's are only in czech but I'll hope you can make something out of it.
Some technical data:
200 W / 4, 130 W / 8
SNR more than 124 dB
fr. 20 - 200 kHz,
dist. 0,002 %
DPA-386 - The MOSFET Power Amplifier
Click on the picture to get a larger view.
DPA386SE.pdf Schematis and pcb layout
DPA386-Material_Eng.sxc OpenOffice file
ACTIDAMP - The Czech Phono Amplifier
This article is in czech but I'll hope you can make something out of it.
SOFTSTART - The Czech way
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Pavel Dudek
Pavel Dudek passed away 2023. He was known under the nick Upupa epops. We will remember his artwork, beautiful schematics and equally beautiful pcb layouts.
Photo by Pavel Macura
Pavel Dudek to the left. Pavel Macura to the right.