400 Series 1 Build

Joined
May 17, 2023
Messages
305
Location
Finland via the deep south
Tagline
Details, details
#44
Nice clean build. Great work and always something to model your own after.

Whose output relay board is that? Is it Joe's or Don's?

Also, what is that circuit board that is on top of the power supply filter caps?

1702224464596.png

Never seen anything like that before. Does it come with them or is it an adder?
 

Hexis22

Chief Journeyman
Joined
Dec 28, 2022
Messages
661
Location
Wisconsin
#45
Nice clean build. Great work and always something to model your own after.

Whose output relay board is that? Is it Joe's or Don's?

Also, what is that circuit board that is on top of the power supply filter caps?

View attachment 78701

Never seen anything like that before. Does it come with them or is it an adder?
The speaker output DC protection PCB is from Don, with my components and assembly.

The power supply cap assemblies are from White Oak. The PCB converts the caps solder terminals to screw terminals.
 

Hexis22

Chief Journeyman
Joined
Dec 28, 2022
Messages
661
Location
Wisconsin
#49
Very clean looking job- beautiful work!
Thank you!

I try to build every project as if it were my own equipment. The internal construction means more to me than outward appearance, not to say I don't like a sexy outer appearance...

Every solder joint, wire placement, and component is finished with purpose.
 

wattsabundant

Chief Journeyman
Joined
Apr 26, 2011
Messages
926
Location
Central Ohio
#52
I noticed on the relay board that R6 and C3 are not populated. This snubber protects the chip from the inductive kick of the relay coil. The values are .1uf and 100 ohm. The alternative is a clamp diode (1N4004) across the coil on the back side of the board with the cathode on pin 8. The snubber or diode is necessary for proper operation.

These days I use the diode and install an LED and current limiting resistor in place of the snubber. The LED lights when the relay pulls in. The clad will eventually get changed when I run out of the existing stock.
 

Hexis22

Chief Journeyman
Joined
Dec 28, 2022
Messages
661
Location
Wisconsin
#53
I noticed on the relay board that R6 and C3 are not populated. This snubber protects the chip from the inductive kick of the relay coil. The values are .1uf and 100 ohm. The alternative is a clamp diode (1N4004) across the coil on the back side of the board with the cathode on pin 8. The snubber or diode is necessary for proper operation.

These days I use the diode and install an LED and current limiting resistor in place of the snubber. The LED lights when the relay pulls in. The clad will eventually get changed when I run out of the existing stock.
Don, thanks for the comment.

I placed a 1N4004 diode on the underside of the board across the coil.

I just omitted the LED and current limiting resistor you place on R6 and C3.
 
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