Treblog

You're never too old to learn something new. Brilliant!

I picked up my F5 parts at the post office yesterday. Yesterday evening I started stuffing the boards and soldering everything. The quality of the PCBs is excellent, a really good job Peter Daniel did in making the layout. Minor niggle, the PCBs are made with tiny resistors in mind. My 0.6W resistors are too large to be lying flat on the PCB, they have to stand upright.

I ordered 0.47 Ohm resistors for the source pins of the output MOSFETs but received 0.50 Ohm instead. I'll just have to account for their slightly higher resistance when adjusting the bias current. No problem though.

The PCBs are now almost done, they're still lacking the thermistors and output MOSFETs. The MOSFETS will have to wait until they're mounted on the heatsinks. The thermistors will have to be bought still. More pics in the F5 photo album.


I also picked up a copy of the new Chris Ryan novel Firefight. Something to read coming summer holiday.

I ordered my F5 amp parts last week. With any luck they will arive this week. I only have to buy four NTC thermistors. I have seen really cool ones. Epcos makes thermistors with an aluminium screw casing. This enables you to screw the head into the heatsink. My idea is that it will speed up warm-up time and shorten the time needed to dial in the correct amount of bias current.

What I don't have for the F5 amplifier yet is that what costs a small fortune: the large heatsinks, the tansformer and the PSU capacitors.