Salvage and Exploration of a MC14541 Timer IC

RE: Salvage and Exploration of a MC14541 Timer IC

D_Hersey — Tue, 22 Sep 2015 15:56:13 GMT

Also, the feedback loop only has to remain in control at low wind-speeds. Bearing error becomes less significant when the wind blows faster. Prior, substitute 'current pulses' fir pulses.

RE: Salvage and Exploration of a MC14541 Timer IC

D_Hersey — Tue, 22 Sep 2015 15:51:30 GMT

[You can use a mouse keyboard from the OS 'til your new keyboard comes. I am using a Cherry tactile feedback model on this compy, no logo key, It is pretty neat.]

I beg to respectfully differ, John. Let me state that the fest last week was well beyond everything it was cracked up to be, so I may siide from my usual thumb-nailing incoherence into raw clang association. We have to trim things up and use pulses and filters, but I know that people have tricked this scheme into working. We have the fan inside a powerful control loop. We have an accurate feedback of fan speed, we can use PLL to couple fan speed to a crystal, basically eliminating timing errors, at the expense of even more filters. We power the fan with little rectangular pulses that are tiny in themselves. We count them. We can model rotor inertia in software. Not cheap, but probably do-able.

RE: Salvage and Exploration of a MC14541 Timer IC

D_Hersey — Tue, 22 Sep 2015 06:04:20 GMT

Let's say you were making an anemometer. You could hook up a propeller to a motor and measure the power output. But for low wind speeds you would be in the grass due to bearing friction. If your set up a circuit that rotated the propeller at a fixed speed you could measure the energy your feedback loop was using. This method would have a little turbo lag, but could measure these low wind currents. You could have a propeller in a tube to get the N<>S vector and another to get the E<>W vector, or a propeller in a tube plus a non-directional rotor, such as Savonius turbine and some complex-number jiggering.

RE: Salvage and Exploration of a MC14541 Timer IC

D_Hersey — Tue, 22 Sep 2015 05:50:45 GMT

The really interesting chip of this type is 565 PLL.

RE: Salvage and Exploration of a MC14541 Timer IC

shabaz — Tue, 22 Sep 2015 02:48:13 GMT

Hi John,

Cool device! It is great seeing how useful some of these old ICs are, and so cheap I will try to get a few next time I order some parts.

I need something like this to build a coffee maker timer.. : )

RE: Salvage and Exploration of a MC14541 Timer IC

D_Hersey — Tue, 22 Sep 2015 00:53:33 GMT

4060 is a similar chip:

https://www.fairchildsemi.com/datasheets/CD/CD4060BC.pdf

RE: Salvage and Exploration of a MC14541 Timer IC

Jan Cumps — Mon, 21 Sep 2015 20:10:01 GMT

Most of the time I do not blog about these projects

Change that habit, please [View:/resized-image/__size/16x16/__key/commentfiles/f7d226abd59f475c9d224a79e3f0ec07-014465db-fb22-434c-93c7-3347b31816f6/contentimage_5F00_1.png:16:16].

It's fun to read posts about side projects and little thingies.

RE: Salvage and Exploration of a MC14541 Timer IC

DAB — Mon, 21 Sep 2015 18:56:23 GMT

Nice post John,

I like to take old equipment and find new uses for them.

Your timer looks like it could have a lot of uses in various applications.

Well done.

DAB