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Recent content by voxmagna

  1. V

    Electric pump to dispense the hand sanitizer gel

    I'm trying to do something similar with another liquid. A peristaltic pump might work but any pump can take a surprisingly high d.c current and batteries may be larger than the vessel! Also. pumping any kind of 'Gloopy' material is problematic for most pumps. It seems to me you can't do better...
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    Simple a.m modulator output not what I expect?

    I've been quiet but working hard on this! There are so many schematics on the web that either mislead or just don't work when you breadboard them. The outline to my project is a.m modulating a 40kHz carrier with 625Hz (or 1kHz) to use as a driver signal in an H bridgeamplifier to drive high...
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    Simple a.m modulator output not what I expect?

    Thanks, I'm working on that.
  4. V

    Help reading schematics - artificial ventilator for someone

    Isn't that like the bag paramedics use and squeeze? There are ideas here, but IMHO I wouldn't like to be hooked up to one. I like the idea of hooking something up to a resus dummy though. https://www.instructables.com/id/The-Pandemic-Ventilator/...
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    Simple a.m modulator output not what I expect?

    Duh... I'll try adding a 40kHz filter to the output. Thanks
  6. V

    Simple a.m modulator output not what I expect?

    Thanks. I've looked at several 'simple' a.m modulators now and they all post the classic waveshape and not what I get when I try their schematics. I'm getting the impression many posted schematics haven't been built. I might experiment with the MC1496 but was hoping to avoid negative supply...
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    Simple a.m modulator output not what I expect?

    Thanks for quick replies. I agree it looks like a mixed output. I used a transformer in the emitter of the BF194 as a last resort because i've tried similar schematics using a J-FET or transistor and all behave the same. As I understand it I should be controlling the transistor gain to get...
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    Help reading schematics - artificial ventilator for someone

    I looked into this when coronavirus was first being talked about, even found a DIY design which looked interesting. I read some into hospital ventilator designs. When this disease takes hold the efficiency of the lungs to get oxygen into the blood drops dramatically. Ventilation with air on its...
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    Simple a.m modulator output not what I expect?

    Hi, I'm very rusty building from schematics. I want an a.m modulator for a 40kHz carrier with a modulating frequency of 1kHz. I've tried 3 or 4 different schematics and all give an output I didn't expect. I expect positive peaks of the envelope to correspond with positive going peaks on the...
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