Philip Bragg

@[email protected]
380 Followers
464 Following
4K Posts
Mostly electronics and all sorts of synthesizer, he/him.
Websitehttps://mossyvale.co.uk/
Bluesky@synx508.bsky.social
Philip Bragg2d ago
Andrew Zonenberg2d ago

This is NOT a commitment or statement of intent to build such a tool.

But if it existed, how likely would you be to use a libscopehal-backed T&M application for iPad? This would not be a port of ngscopeclient, it would be a from-the-ground-up touch first GUI backed by the same suite of protocol decoders and hardware drivers, and probably reusing a few of the waveform rendering shaders.

Maximum memory depth would be limited to probably 10M points or so by available RAM, and it would likely not be possible to exchange scopesession's with ngscopeclient exactly, although there would probably be some sort of export capability to at least interchange waveforms.

Android is significantly less likely of a target because apple silicon's graphics/HPC capabilities are so far ahead of the competition, so if a tablet based platform were to be created apple silicon is the natural target.

Would definitely use
17%
Might be interested
34%
Would definitely not use
47.2%
Other
1.9%
Poll ended at .
Philip Bragg3d ago
Bosco3d ago
Good night and sweet dreams. Greetings from the star destroyer.
#hp #agilent #keysight #tektronix #rohdeundschwarz
Show threadPhilip Bragg3d ago
Nearly 2W out with it running from 24V. Pretty sure I didn't try this back in the 80s.
Show threadPhilip Bragg4d ago
Yes, that's a Home Office logo on my power meter's 19" panel. It was from a decommissioned emergency services radio site, sold at, I seem to recall, the McMichael rally when it was still held in Burnham at the community centre.
Show threadPhilip Bragg4d ago
I'm sure my original had a sniff of bias, which often increases the gain. I might try that, but not tonight.
Show threadPhilip Bragg4d ago
Actually it’s doing a bit more than 1W but not much. (bottom scale divided by ten for my 10B element)
Philip Bragg4d ago
I built my first FM transmitter in the late 1980s using bits that I had lying around, with no real knowledge of RF but a tenacious approach to trial and error. I had a 2N3866 driving a BD139 to get around 1W. BD139s are audio devices and I have a drawer full of them so I thought I would verify that this really works. It does. It’s very stable owing to the meagre 3dB or so of gain. DC efficiency is an excellent 85% for the amplifier in isolation and you have to ignore the fact that the driver is using more current!
Philip Bragg6d ago
If you liked Brass Eye then these deep dives are interesting, here's the music one. https://www.youtube.com/watch?v=vfnyOaifpBY
Brass Eye Music References #vinylcommunity #vc

A sub-aquatic plunge into the extensive musical references in Brass Eye by the series director - Michael Cumming #vinylcommunity #vc

YouTube
Philip Bragg6d ago
718 clone works better now. Two of the three bands of compression in action. PWM chops the signal up to control the amplitude.
Philip BraggMar 25
The audio processor that I made emits a horrible amount of RF noise. It seems to be caused by the discrete comparators, I've built a single comparator on a breadboard and confirmed that it rings badly at around 12MHz, particularly when only partially activated by a very short or small excursion beyond its threshold. Adding 1000pF on the base of the "waggling" side seems to stop it without unduly loading the signal.