I, for one, would go for it! I've had experience with SMPS: the primary side is within reach of everybody who ever fixed or modified a PC power supply. The secondary side is more problematic because
I'll try to furnish some information on the feedback subject: Timm didn't provide any because it's not needed. I worked for a few years at Tadiran electronics on the GRC-106 SSB radio. It had a SMPMS
One caveat, though! In the original design, with no feedback, it was easy to add a filter to the output. With a closed loop system care is needed: the additional filter introduces an additional pole
Definitely! Any amplifier above the HF range is VERY dependent on layout and PCB design. With the low input impedances present, it would be next to impossible to design a good input matching network.
Try the Stepan Company. They used to manufacture a few kinds of silver epoxy years ago Alex 4Z5KS Silver epoxy is still around. We used it to seal microwave modules prior to going in the oven were it
...I once took apart an old RPM meter for cars. What I saw there was a quite regular movement: the difference was a triangularly shaped wedge, formed into a circle instead of the regular solid core u
This is true up to a point! You have to load the diode VERY lightly in order to obtain a meaningful Dc out of it and the true low level diodes is made from silicon with a slightly different doping th
--Original Message-- From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com] On Behalf Of Bill, W6WRT Sent: Wednesday, June 10, 2009 8:21 PM To: Robert Groh Cc: amps@contesting.com Sub
...if anyone wants to get away from the tested and true PI or PI-l circuits a better choice would be a link coupled tank circuit or a multiband circuit similar with the Z-Match innards. This is exact
That was done in order to avoid VHF ring oscillation, a common problem with paralleled tubes. They ha d a tendency to oscillate at a frequency set by the tray inductances of the tank circuits and the
No, the 4-1000 is wired with both grids grounded for GG operation. The degradation in the amplification factor is so slight as to be negligible. Don't forget that in the GG configuration the grid its
I would like to remind a point peculiar to GG amplifiers: there is an effect called transferred power. Part of the drive power appearing at the input is transferred to the amplifier's output and it g
You can probably use the pyroelectric detector from a junked IR movement detector use in burglar alarms. They are quite sensitive and you can use very simple optics, if needed, to measure temperature
Yes, there was! At the time it was one heck of a tube and you could get them as pullouts from police and other commercial equipment for a song! It was then usual to replace tubes at regular intervals
Response time, guys!!! Any thermally operated fuse is TOO SLOW to protect the tube. Besides, the spring can carry many tens of Amperes before it heats up enough to melt. You'll probably blow up diode
...the key to the stability is the capacitors! From an RF point of view, the grid is grounded and well, since capacitors work well at 6 meters. Alex 4Z5KS How would you characterize, then, the design
One by one answers: 1) PIN diodes are characterized by the thickness of the intrinsic layer when cut off. Exactly the same with silicone diodes: what sets those apart is the parallel capacitance; big
...definitely metal film! We had a lot of experience with these at Tadiran years ago. At the frequencies you mention stray inductance shouldn't be much of an issue. And stability wise you would be se
..soldering them is not so hard. Just get yourself a liquid flux pen- mine is from Farnell, as it happens- put a small drop on both ends. Hold the part with real fine points tweezers, solder one end
My guess is that the guy meant it as a figure of speech, not literally! Let's not start another flame war! The problem with oscillation is that there are so many variables that it's practically impos