TF3CY » MRF150 http://www.tf3cy.is Benedikt Sveinsson Tue, 13 Jul 2010 19:43:17 +0000 en hourly 1 http://wordpress.org/?v=3.0 Spreader drilled and tapped http://www.tf3cy.is/archives/83 http://www.tf3cy.is/archives/83#comments Sat, 21 Nov 2009 20:46:09 +0000 tf3cy http://www.tf3cy.is/?p=83 I had some issues drilling the spreader, I thought the drill would go through the copper like butter, that is partially true, but as this is a very thick piece I’m drilling, it grabbed the drill and twisted it. I had two 2.5mm drills twist to bits and I could not get them out of [...]]]> I had some issues drilling the spreader, I thought the drill would go through the copper like butter, that is partially true, but as this is a very thick piece I’m drilling, it grabbed the drill and twisted it. I had two 2.5mm drills twist to bits and I could not get them out of the hole. This actually happened on the first hole I drilled, so I ended up moving the whole PC board 2mm to the side. Now I marked the MRF150′s and I think it’s very important to mark them first, drill and solder afterwards so there will be no forcing of the pcb when they are clamped tight. Unfortunatly I broke on drill in one of the mrf150′s mounting hole, but I could drill the hole and tap it. I hope I did not damage the tapping drill, as a bit of the old drill was wedged in the hole!. secondary plan was to widen this one hole to M4.

Here is a picture, this was surprisingly badly drilled – I blame not having a proper tool to mark with ;P

here is a picture of the “handywork” – put some lines over to see how it really went, it’s still withing tolerance and the mrf’s are clear of the PCB, and no forcing when taped down. I used M3 screws – and for that I think you have some room for “mistakes”

spreader ]]> http://www.tf3cy.is/archives/83/feed 0 600W process report http://www.tf3cy.is/archives/17 http://www.tf3cy.is/archives/17#comments Tue, 03 Nov 2009 22:46:38 +0000 tf3cy http://www.tf3cy.is/?p=17 This is based on the Motorola EB104 bulletin:

EB104 amplifier board ordered from Communications Concepts, including 4x MRF150 Omron 12V Relays ordered from Ebay – used for TR switching and filter selection Toroids and accessories orderd from Amidon Large heatsink gotten from my father, TF3T 1200VA toroid transformer was bought in my trip to Shanghai – loong story there! Going to [...]]]> This is based on the Motorola EB104 bulletin:

eb104.13

  • EB104 amplifier board ordered from Communications Concepts, including 4x MRF150
  • Omron 12V Relays ordered from Ebay – used for TR switching and filter selection
  • Toroids and accessories orderd from Amidon
  • Large heatsink gotten from my father, TF3T
  • 1200VA toroid transformer was bought in my trip to Shanghai – loong story there!
  • Going to order some silver-dipped MICA capacitors and PIC MCU + filter capacitors from www.mouser.com

Still need:

  • Copper spreader
  • 12v cooling fans
  • Hardware
  • Heatsink for the PSU – asking locally

Next thing is to build the case

Going to build it from Aluminium parts available locally, have made some sketches in AutoCad, but it’s hard to draw it exactly as I don’t have all the components in hand, and don’t know the exact dimensions of some of the components.

]]> http://www.tf3cy.is/archives/17/feed 6