Concept
The maximum power consumption is app. 800mA at 5V. Today a switched power supply is used for this kind of task but I wouldn't have a 60kHz generator with voltage slopes greater than 300V in my preamplifier (typical parameters of a flyback converter). The classical way is also ugly: a 7805 voltage regulator has 2V drop-out voltage at 1A - you need at least a transformer with 9V output voltage which leads further to 4W power losses.
I have chosen a LM2940 which has a typical drop-out voltage of 0.5V in combination with a 7V transformer (I found only toroidal transformers with this output voltage). To generate a little bit reserve I took a transformer with two output windings and use the two way rectifier topology which saves one forward voltage. I inserted also a huge Schottky diode (5A) to reach a very low forward voltage at 1A. Reward for these efforts: only 2W power losses...
Hardware
The whole KiCad-project (including Gerber-files) can be found here. Remark: it was made under Linux with KiCad-version 4.0.7 using this additional libaries. The bill of material (bom) as semicolon separated text file contains some comments about part dimensioning / quality.
License
Please keep in mind: all content on this page is licensed under the terms of the GPLv3.
falk.richter*at*yandex.com
Last update: December 20, 2019