I too have put the regs in the same box as the transformers, would it be better to have them in the same box as the consumers?
What are the downsides and are there big improvements having them close?
I don't know downsides, well with 4 Kelvin connections if the distance isn't too long doesn't matter a lot in a separate box but I prefer regs & RIAA same box.
To me it seemed better to keep ac away from the riaa amp. I am under the impression that the 4 wire output is ok for the distance from the regulator to the load...but I often make wrong assumptions.
The shorter the wires the better, even with Kelvin connection.
If you can, put in the PS box rectifiers and first cap and regulators close to to RIAA circuit.
If you can, put in the PS box rectifiers and first cap and regulators close to to RIAA circuit.
Hi all,
Feeding the Low MC from a 12VAC source as per pdf does the 7809 need heatsink ?
Rephrasing my question, from your experience how much dissipation the 7809 can do without any heatsink ?
Feeding the Low MC from a 12VAC source as per pdf does the 7809 need heatsink ?
Rephrasing my question, from your experience how much dissipation the 7809 can do without any heatsink ?
Since the rectifiers are on the board with the regulator I am leaving them in the same chassis. When I put the complete unit into the cabinet with the other equipment I will make the connecting wires from the power supply box to the riaa box as short as possible. Should be only a couple inches.
Evan
I should be able to finish this up this afternoon...I will report back
Thanks for the good advice, Evan
Thanks for the good advice, Evan
Since I am going to open this up to shorten the wires here is a question. What would be the smallest gauge wire that should be used. Thinner wire is easier to work with.
post7455,
are those fuses in the bottom left corner at risk of being shorted to chassis?
Are they Mains fuses?
are those fuses in the bottom left corner at risk of being shorted to chassis?
Are they Mains fuses?
yes, they are mains fuses, but I don't see any way for their connectors to short to the chassis. The lack of depth perception in the photo makes them look closer the chassis then they are.
Why two mains fuses?
Are you fusing the Neutral?
What if a short length of strand from a stranded cable fell in through a ventilation hole?
What if the screwdriver you are holding touched the exposed live connections?
Are you fusing the Neutral?
What if a short length of strand from a stranded cable fell in through a ventilation hole?
What if the screwdriver you are holding touched the exposed live connections?
Great I have plenty of cat 5 wire. I am thinking 2 strands per connection.
I fuse both in case there is a mix up in the houses wiring. Making up the connection to one fuse or two is about the same amount of work and I saw no reason not to.
I will Put heat shrink over the exposed connections of the fuses and or a small plastic cover over the whole area.
Thanks, Evan
I fuse both in case there is a mix up in the houses wiring. Making up the connection to one fuse or two is about the same amount of work and I saw no reason not to.
I will Put heat shrink over the exposed connections of the fuses and or a small plastic cover over the whole area.
Thanks, Evan
if the Neutral line fuse blows, there is a high risk that the chassis can be LIVE, even though the equipment "sounds" dead.
It won't need one, in this case it will dissipate 90mW and it can be relatively safe for ~1W on its own.