It's massive, it's power hungry, it's expensive to build, but sound is uncompromised: 50 W A class amplified designed by Nelson Pass, built by me :)
Enclosure is almost identical to original Pass Labs amplifier (older models), but front panel thermometer is completely redesigned by me. Except showing the temperature of output MOSFET transistors, thermometer also acts as thermostat - monitoring and controlling power supply by using triac to power off amplifier in a case of overheating.
If you want you can build this thermometer, all needed files will be included in the end of this post.
Looking in the inside the construction is dual-mono, starting from double secondary winding on 800 VA toroidal transformer:
Buliding process
First order was active parts, i.e. amplifier PCBs with all parts on it, power transformer, rectifier with capacitor bank.
The enclosure I ordered came with malfunctional meter on front panel. After reporting this faulty part to the seller he refunded me some small amount of money. I throw away that meter and designed completely new one, digital, with color LEDs and Arduino as thermometer:
Temperature is measured on one of the power MOSFETs, by Ds18B20 thermometer:
Thermometer controls power supply to the amplifier. It trips if overheating is detected.
The unit is on table for testing and adjusting. DC offset and idle current:
Back side of the amplifier. Just speakers connection and RCA inputs. Power amp doesn't need any more.
Assembled and in a place. Connected to Auralic Vega DAC and ProAc Studio speakers. It produces sound to remember.
All assembly documentation I have can be found here.
If you want you can build this thermometer, all needed files will be included in the end of this post.
Looking in the inside the construction is dual-mono, starting from double secondary winding on 800 VA toroidal transformer:
First order was active parts, i.e. amplifier PCBs with all parts on it, power transformer, rectifier with capacitor bank.
The enclosure I ordered came with malfunctional meter on front panel. After reporting this faulty part to the seller he refunded me some small amount of money. I throw away that meter and designed completely new one, digital, with color LEDs and Arduino as thermometer:
Temperature is measured on one of the power MOSFETs, by Ds18B20 thermometer:
Thermometer controls power supply to the amplifier. It trips if overheating is detected.
The unit is on table for testing and adjusting. DC offset and idle current:
Back side of the amplifier. Just speakers connection and RCA inputs. Power amp doesn't need any more.
Assembled and in a place. Connected to Auralic Vega DAC and ProAc Studio speakers. It produces sound to remember.
All assembly documentation I have can be found here.
Document link doesn’t work? Nice looking F5, congrats!
ReplyDeleteIt's fixed now. Everything is up there. Enjoy!
ReplyDeleteExtremely cool visual design, adding some minimal (nano) digital notes seems to fit perfectly. Would like to see, and even more to hear it!
ReplyDeleteHi! looking for the google drive build thread, its not working. Thanks for the writeup! Where did you source the thermostat for the front panel?
ReplyDelete