jejt / jmons

Engineering Tommorrow

EAGLE CAD and Valves


Uhh.. ok. The biggest problem I have with EAGLE Cad (and I only have the freeware version here – my job lets me use design tools at work, but most of the stuff I talk about on here is actually for home, and I’m trying to finally get some of it online as part of my “open source” roots.) is…

the lack of parts. Too often I come across a custom part that I want to incorperate in my circuit. When I draw my circuits by hand, thats not a problem, but to get these things online, I need to digitise them, and scan’s of my lab book just really arn’t suitable.

This time, I found the need for a particular Triode – the 6S7L – now, before people start asking me questions about Triodes and Valves in general, I don’t know, this is the first time I’ve ever used them and I’m getting quite excited over the prospect. But, Eagle Cad just dosn’t contain the parts for some of these devices, so more and more I’ve been building my own versions.

Because EagleCad is designed to go from a schematic straight to a board layout, I’ve found that I’ve been using the schematics as close as possible, but I really have been just throwing pins at the package file, meaning that if anyone where to convert my schamtics to boards then they will certainly a) be wrong and b) could be quite ammusing.

Anyways, this:

6sl7dual-triode

is the current working diagram. Yes I stole it. The book in question actually, “22 Radio and Receiver Projects for the Evil Genius” was a Christmas present, and I’m getting quite annoyed with the number of typing mistakes I’m finding in it. I wouldn’t say its the best book – you have to be a genius (or be good at pretending to be one) to understand some of the bits in it, but forging onwards … high voltage valve radio soon.

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