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/diy/, check out this schematic for a tube morse-code oscillator. The values of components haven't been calculated yet.
It uses a triode-pentode, with the triode as a Hartley oscillator (copied almost verbatim from the old Allen organs, actually) and the pentode as the output tube. I'll probably use the ECL86 tube.
Note the lack of a HV transformer. I'm rectifying the mains directly to provide b+. This, of course, is a huge no-no. The reason always given for this is that if you reverse the plug, the chassis becomes live. But look how I have this set up: That HV bridge rectifier isn't tied to ground at all. The output is isolated with a transformer, and the key operates on low voltage from the filament transformer through the use of a relay.
I don't see any reason this would be unsafe or non-functional. What's your opinion?
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Hello /diy/, I come to you from /o/ with a problem....
So i purchased headphones online (bad idea), and after a few uses, one of the screws holding the actual speaker got loose and fell ff, thereby making the speaker come off. I got the screw back and fitted it back in but a few days later it came out again. After further inspection, it turns out the ( I have no idea what its called) patterns in the hole where the screw goes in were destroyed, so the screw now went in and out of the hole easily.
As a quick fix, I (stupidly enough) applied glue and attempted to stick both pieces back together
>Note that this piece should only move for 1 cm in both left and right direction, but i decided to sacrifice that, hence the glue.
Of course, the result was a failure. The speaker is connected and all but it feels too loose and it will come off any second.
I have really come to love those headphones for their surprisingly good bass, so please help me save them.
>pic related (the glue)