Well, this is the first post of 2019.
Since the start of the blog the idea was always to document some of my projects and also as a means that others can be motivated to build something.
This would e a win win situation, the more people building the more need for components so the more shops would keep open since lately the tendency is for hobby electronics to decline. Also I would keep information on my project that could be handy when I have to fix them since I'm not good on taking notes.
Said that, here's a small conversion of a 250V AC panel voltmeter to 25V DC.
The schematic is nothing more than a series diode (using one of the existing from the original PCB) with a resistor and a variable trimmer in series with moving coil meter. The original schematic (for AC) is seen on the background.
Calibration was just using a 9V battery and setting the trimer to read 9V, (90V AC on the original scale). Not critical here since I just wanted a means of checking if one of my DC power supplies was outputting the selected voltage.
Have a great one!
Since the start of the blog the idea was always to document some of my projects and also as a means that others can be motivated to build something.
This would e a win win situation, the more people building the more need for components so the more shops would keep open since lately the tendency is for hobby electronics to decline. Also I would keep information on my project that could be handy when I have to fix them since I'm not good on taking notes.
Said that, here's a small conversion of a 250V AC panel voltmeter to 25V DC.
The schematic is nothing more than a series diode (using one of the existing from the original PCB) with a resistor and a variable trimmer in series with moving coil meter. The original schematic (for AC) is seen on the background.
Calibration was just using a 9V battery and setting the trimer to read 9V, (90V AC on the original scale). Not critical here since I just wanted a means of checking if one of my DC power supplies was outputting the selected voltage.
Have a great one!
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