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ttyloopdriver reviews and mentions
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What We Learned Making a Plastic Injection Mold with a Chinese Mold Maker
> Out of curiosity, wouldn't it be easier/cheaper/faster to use some existing off-the-shelf design and drill/machine some holes if you need it slightly modified?
For small production runs, definitely. There are standard aluminum extrusions for boxes with PC boards. You slide the PC board in, and provide custom flat end plates with holes for connectors and controls. Here's one of mine.[1] The end plates were cut on a laser cutter. Here's a supplier in China.[2] For small boxes, the aluminum extrusion alone should cost a few dollars.
Somewhere above a few thousand, custom injection molding becomes cheaper. Amusingly, these are better boxes than plastic injection molding, but don't look like consumer products.
[1] https://github.com/John-Nagle/ttyloopdriver/raw/master/board...
[2] https://www.alibaba.com/product-detail/CHANGHE-electronics-a...
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LTSpice Tutorial
It's extremely useful when used for its intended purpose - designing power supplies using Linear Technology components. Here's a design I did with it.[1] This is a little box for driving antique Teletype machines from a USB port. Those need a current loop running at 60mA constant current, up to 120VDC, driving an electromagnet with a 5H inductance. I wanted to generate that from the USB port's power, which required a moderately exotic switching power supply design.
The LTSpice simulation made it possible to get that right. Especially from a noise control perspective. Switching power supplies generate spikes, and so does turning off that electromagnet with its huge inductance. Those spikes have to be kept out of the USB port or its protection circuitry will shut it down. Spikes need to be suppressed in both the current and voltage dimensions. LTSpice lets you watch the switcher spikes, the elecromagnet spikes, and the inrush current. When you add a few surface mount capacitors and ferrite beads in the right places, the spikes can be almost totally suppressed. It just took a few cheap parts. The simulator lets you find values that work.
The SPICE models for Linear Technology components match reality well. That's what LTSpice is really about - a good model library.
[1] https://github.com/John-Nagle/ttyloopdriver/tree/master/circ...
Stats
John-Nagle/ttyloopdriver is an open source project licensed under GNU General Public License v3.0 only which is an OSI approved license.
The primary programming language of ttyloopdriver is AGS Script.