开云体育

If building a test jig for evaluation of IRF510 devices, maybe we do not have to test for actual performance of no-name or other-name devices. If the test jig were first used to evaluate a known good

Farhan, and others Just finished reading over their group page. At first glance it appears to be the work of just two people who possibly work at Virginia Technical College. Might even be the basis of

An answer for everyone! Thank you all for the answers and for the small scheme that will allow me to add the CW transmission in A1A also in the EASY BITX that I am assembling, without resorting to

I still remember sore fingers from lacing cables with waxed linen cord.

*Hello, * This aftermoon it's was the first "smoke test"... After checking the regulator voltage, I directly connected the arduino (already programmed from the old assembly) and connected the screen

Loris A mixer inherently needs ac signals on 2 ports to produce an output. If we inject dc, it can bias the diodes, if enough turning them steadily on, so it can't mix anymore. Ubitx does this,

A recording of the very interesting and indeed entertaining talk by *Bob Heil* is now available on YouTube: https://youtu.be/Lx2dP0lOQL0 73 Trystan G0KAY

A keyed audio oscillator can work, but the oscillator and mike amp must feed a clean sine wave at the correct level into the modulator to get a clean CW signal. Far simpler to add a resistor from the

To each, his own. I find Dave's work beautiful and would make everything I build look as nice if I could. Jack, W8TEE

Why not use a keyed audio oscillator with suitable level adjustment at the mic input?

Squaring off all the wires like that was typical of radios built 100 years ago: https://en.wikipedia.org/wiki/Grid-leak_detector#/media/File:Single_triode_receiver_1924.jpg

Farhan: I know what you mean. Most of my kits look like controlled chaos even though you'd think a kit's PCB would make things look pretty good. Then there's the work by Dave Richards, AA7EE, where

Shirley is right, Vishay bought IR. My story about the WA2EBY amp not working well at first with some non-IR IRF510 is vaguely mis-remembered.

It is the economy of scale that kicks in with hf signals. It works out to be cheaper than the bill of materials! The way to keep the price under $100 is to build it the ugly way. You can always

JG I am well aware of all that in fact the Gate capacitance of the IRFz24 is about double that of the IRF 510 BUT? in general these will be going in a bolt on amp that has about 4-5 Wats pushed up

It seems their BOM totals $190USD.? You can buy a basic kit w/ acrylic front/rear panels and mike, shipped via DHL, for $160USD.? I guess there is a price for education!

Loris, I do not claim to be an expert on mixers.? I am only an amateur at understanding how they work.? Here is what I think would happen. The DC voltage would be a 0Hz signal that is being added to

Vishay bought International Rectifier. The Vishay parts are the direct lineal descendents of the original IRF parts.

Jonathan Kayne, KM4CFT did post about the project here a couple of times -

I ask to the most experienceds of me in the use of MIXERS: if I inject a direct voltage (eg 1Vdc) to the BF input of the modulation mixer, is it possible that the BFO frequency comes out unmodulated?