Blog - All Comments

RE: Tube Amp on a PCB

dang74 — Tue, 25 Jul 2023 19:50:07 GMT

Nice. I am too afraid to play with high voltage so the 273V output you created at the transformer scares me. I was thinking of doing a pre-amp using the 12AE6 or 12AX7. That would keep things below 30V. I was then thinking of having a solid state output amplifier. Not sure if that approach is ridiculous from a hi-fi point of view, but that's what's inside my comfort level. Cool project and the 60s tunes featured in the video definitely suit a tube amplifier. [emoticon:c4563cd7d5574777a71c318021cbbcc8]

RE: Hiraga PreAmp .. build 5

DAB — Mon, 18 Mar 2019 20:25:48 GMT

Now you know why people are going to laser cut wood construction.

DAB

RE: LED fade in/out effect

dubbie — Thu, 10 Jan 2019 12:01:51 GMT

Just shows that you can do with analogue, what you can do with microprocessors. Nice final product.

Dubbie

RE: 555 Timer Voltage Inverter

foohoa — Sat, 05 Jan 2019 16:15:52 GMT

U can add in the power transistor to boost up the load handle

My teacher have this concept really long time ago, that time doesn't even have inverter aircond, we test it using light bulb and it save around 30% of current with same bright

And because of the inverter technology didn't implement, so this project just KIV

RE: Pulse Hunter

genebren — Sat, 15 Dec 2018 18:41:05 GMT

Very nice blog! Just a couple of things that I noticed that I was not too sure about.

1) There is a buzzer that is connected direct to the 5V supply input. Is the buzzer intended to alert whenever the unit is on? Not sure why you want to do that.

2) In the isolated power supply, I noticed that there was no flyback diode to suppress the voltage that is generated when the primary of the transformer is shut off. You might want to look into this to help prevent any damage to your switching circuit.

Otherwise pretty cool. I have worked with a few engineers that came out of groups developing commercial pulse oximetry instruments. They were doing some pretty aggressive filtering of their signals (>10 tap filters) to clean up their signals. The load of these filters on a microprocessor where pretty heavy, up to the point that there was little to no background time available (of course they were using 8051 derivative).

Gene

RE: Pulse Hunter

jw0752 — Sat, 15 Dec 2018 16:52:06 GMT

This is a very interesting project and you have done an excellent job of explaining the circuitry and the physiology behind the effect. I look forward to your followup posts.

John

RE: CVBoard: new way to play with modular synths

costantinorizzuti — Thu, 13 Dec 2018 09:55:25 GMT

thanks to [mention:2136c4649d3b47f78653b7e97ac61f69:e9ed411860ed4f2ba0265705b8793d05] for letting me discover this interesting community.

RE: LED fade in/out effect

balearicdynamics — Sun, 09 Dec 2018 22:32:12 GMT

While in the first video the circuit shows - at it is - almost simple, the real world effect - shown in the second video - is very scenic.

Enrico

RE: LED fade in/out effect

genebren — Sun, 02 Dec 2018 21:22:29 GMT

Very cool effect. It would be interesting to try this out with a controller per light approach so that the lights faded in and out individually.

Well done!

Gene

RE: LED fade in/out effect

DAB — Sun, 02 Dec 2018 20:38:55 GMT

Nice build, kind of reminds me of what happens when you have a flacky power generator.

DAB

RE: LED fade in/out effect

14rhb — Sun, 02 Dec 2018 19:39:28 GMT

That is really effective from such an apparently simple circuit, I like it.

Rod

RE: LED fade in/out effect

Anonymous-532400 — Sun, 02 Dec 2018 16:49:02 GMT

Looks like a neat little circuit!

RE: LED fade in/out effect

jw0752 — Sun, 02 Dec 2018 04:27:41 GMT

Hi,

Nice project. It is lots of fun to build and experiment with simple circuits. The way you designed the board suggests that you had a purpose in mind for it.

John

RE: 555 Timer Voltage Inverter

jw0752 — Thu, 29 Nov 2018 03:03:06 GMT

Hi Frank,

Seems that there is a lot of interest in doing electronics on this forum [View:/resized-image/__size/16x16/__key/commentfiles/f7d226abd59f475c9d224a79e3f0ec07-e9cd9869-97d1-4f54-9edf-6521531c60ef/contentimage_5F00_1.png:16:16]. Thanks for a great post and don't you love the wealth of info in the comments afterwards.

John

RE: Tube Amp on a PCB

three-phase — Wed, 28 Nov 2018 21:00:01 GMT

Great project, thanks for sharing.

Kind regards.