Dashboard PCB Replacement (CJH Design)

[icosahedron]

Refer to CJH's pdf on how to mount the regulator. It must be mounted flat down on the board using the mounting hole. The PCB itself then acts as a heat sink. Mica is a good thermal conductor and an excellent electrical insulator. In this application it is not really required.

E D I T: I was wrong about the mica washer. The regulator is mounted on the ground plane of the PCB and only the solder resist will provide electrical insulation without it; a mica washer is definitely required.

[TwinTurbo]

£4 gets you 10 heatsnks with pads and washers suitable for the TO-220 package used by the 7810 .  probably get them cheaper than that.
#
Heatsink.


Which reminded me that I do need some for an application where I am pushig near 1.5A on a 7v Drop. 
Cheaper

[PaulFDennis]

Refer to CJH's pdf on how to mount the regulator. It must be mounted flat down on the board using the mounting hole. The PCB itself then acts as a heat sink. Mica is a good thermal conductor and an excellent electrical insulator. In this application it is not really required.

I wouldn’t place mica in the category of good thermal conductors. It’s typically about 500x poor at heat conduction as aluminium or copper. The regulator should make good thermal contact with either a small heat sink or the ground plane of the board.
 

[TwinTurbo]

 

[TwinTurbo]

First package turned up with the "Mechanical Fit" model.   It's spot on. Unforunatly the LED's I bought to restock my supplies had short legs ( seems to be a common cost saving these days to knock 5mm off a leg. So they don't sit fully home.

 

[icosahedron]

Refer to CJH's pdf on how to mount the regulator. It must be mounted flat down on the board using the mounting hole. The PCB itself then acts as a heat sink. Mica is a good thermal conductor and an excellent electrical insulator. In this application it is not really required.

I wouldn’t place mica in the category of good thermal conductors. It’s typically about 500x poor at heat conduction as aluminium or copper. The regulator should make good thermal contact with either a small heat sink or the ground plane of the board.

I fully agree with you that mica is not the best thermal conductor. The following is what I was trying to get across:

"In electronics, mica is used to electrically isolate heat sinks from components while still allowing heat to dissipate."

[Cecil]

A very very  very big  WELL DONE for bringing this project back to life. This is a perfect example of 80/90 club at its best and fantastic that you are relatively new to the club and able to make this kind of thing happen.

[TwinTurbo]

Excellent progress, TT. I was given the final designs for my prototype a couple of days ago. JLCPCB are out of stock on 4 items needed to populate the board though, so I've got to sit tight until they've restocked next week. It's my first time using them though, so they've offered free assembly which is probably worth it.

Get yourself a ferrule crimper and crimps , work a lot better than plain wire with the screw terminals.