Phase Linear 400 Amplifier Upgrade to WOPL

[mlucitt]

I like lights...

 

[laatsch55]

Even ones that go---POOF??

 

[laatsch55]

Something else that has been in the works for a while is a bias transistor bracket. What I wanted was something that was simple to install and would protect the legs of the transistor and provide a tie point to secure the wires that attach to the transistor legs as these wires are flexed when the controller board is moved for testing or other modifications. I incorporated the fastener (4-40 nut) in the bracket to make the assembly a little easier.

The 400 uses 4-40 screws - what about the 700? Since the fastener is part of the bracket design a larger screw would require a minor design change to accommodate the fastener.

I'll get some more photos tomorrow with wires attached to give a clearer picture of this. The first two photos are of the bracket and fastener and the last three have the transistor included.

Dennis, how long does it take for the machine to lay those out?? That is UBERCOOL!!! And so totally useful.

 

[laatsch55]

Codeine cough syrup, PM Motrin and a Jani Special and I need to quit osting, gonna get goofy.

 

[mlucitt]

Mouser has a new shipping process - $4.99 to a residential address. The shipment travels UPS to the nearest USPS and the mailman delivers it that day or the next day. I like it!

 

[Gepetto]

And you are helping to close the 16B USPS deficit to boot Mark...

 

[mlucitt]

I CANNOT believe their executives received a pay raise for running a business like the USPS into the red by such a huge amount. It that were a commercial entity, it would be gone.

 

[laatsch55]

And the gov't would bail out their pension plan to keep the union vote.

 

[Skratch]

Only in America, Land of the free $$$$$$$

 

[Gepetto]

Mitt's next role, to clean up the fiscal mess at the USPS. Bring in Bain.

 

[mlucitt]

I would support that. And Mitt would probably do it forgoing a paycheck, I'd give him 1% of whatever he could save.

Then we could ship our WOA PL400's cheaper (to keep the thread on topic).

 

[Gepetto]

No fair trying to keep this thread on topic Mark. That is disallowed on this forum

 

[laatsch55]

Like Free Range Chickens----A Free Range Forum---

 

[NavLinear]

I guess I should add a few more posts in this thread now as I now have the fewest.

 

[laatsch55]

That's the OP's perogative......

 

[NavLinear]

Dennis, how long does it take for the machine to lay those out?? That is UBERCOOL!!! And so totally useful.

Hey Lee,

The first two prototypes took about 27 minutes to make but the removal of the support material adds to the total time. The support material had to be dissolved in a water based solution with a detergent added that provides a pH of around 11-13. The bath temperature is kept around 70 C for ABS (material used for this part) and you should have good water movement. This can either be achieved with a tank that has some type of pump to create circulation, or with an ultrasonic tank. We use an ultrasonic tank as it seems to work best. I kept these parts in the tank for several hours, removed them, rinsed them off, let them air dry and now you have a part.

The next batch took longer as I made more (want some?) - maybe two or three hours.

You're right - this is a very useful tool.

 

[NavLinear]

A little neon light with a load resistor would be cool if it would light up as the cap bleeds down and then go off below say 10V.

I actually started off with an LED indicator light with a current limiter resistor and did some tests. I believe I went up to 50 Vdc as that was the highest voltage I could get from the power supply I had on my bench. The light would go dim at around three volts but decieded that reading the voltage level was the direction I wanted to go in.

 

[mlucitt]

Lee, what do you think about running the 5088's out of the chassis and fastening one of each of them to the bottom-side of the heat sink with the NavLinear brackets? We could use the existing hole to run the wires back inside the chassis. I'm sure PL didn't do this because the fragile attachment of the transistor leads and Nav has solved that issue. Having the 5088's on the heatsink would allow faster bias compensation on heat up and cool down, which Joe's board does so much better than the original PL board. Can you get an extra pair from Nav and send to me for evaluation purposes...

 

[laatsch55]

WANT SOME???????????? Got a couple series I's that will need them when converted and I know Ed will want a couple, just cause they're soooo coool. And you have already benefitted from the ED connection. Do they come in a right and left??

 

[laatsch55]

Dude, you've been rerading my mind. During the last few days of the Larrt 700 fiasco, I waas thginking the exact same thing, and also running the thermodiscs out there too. I'm sure Dennis would send you a pair if you askl.