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Analog Dial AVO Amps-Volts-Ohms meter - del00023This was designed, keeping in mind, that sometimes we have few components available and we could be flat broke. Even that you could not carry your DMM somewhere, but you have to make some instrument for a quick need with what is available. If you are out of cash or feel like Robinson Crusoe, then this is a low cost measurement system. I designed it to practice on eagle, i am not sure how this circuit may work, it is not tested . But i have built, repaired and designed many DMMs. So there is a fair chance, parts of it may work :~)IC3 LM555 is to generate -5V from 9V. That reminds me of a story, In 1986 while i was studying BE electronics i got a chance to work part-time in a company that sold-serviced imported instruments, it was called trans-marketing. They were the agents for Racal-Dana, Genrad, Data I/O and so many more. Here i came across a Book called CMOS Hot Ideas of Intersil. I had a chance to observe, build and learn some things here. The ICL7107 circuit was the most fascinating, I also read the books of National Semiconductor here. In those days small firms used to make DPM's digital panel meters with 7107. In 1987 when i got a oppurtunity to design a DPM for a firm, I put the 555 clock in place CD4009 clock shown in intersil, to derive the -5. Potentiometer Dial GIF for above circuit to be used to make a hand-held avo-meter is here. To view the circuit below, Click the Link of PNG or PDF and view the Circuit, PNG can be Scrolled with Mouse and PDF can be Viewed-Zoomed in the Browsers with Acrobat plugin. The Javascript and Images must be enabled in your Browser. |
| PNG-Schematic PDF-Circuit 350kb |
| Analog Dial AVO Amps-Volts-Ohms meter - del00023 |
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The Source File in Cadsoft Eagle - del00023.zip. Data sheets and info useful to study and build this circuit. In those days other databooks i referred were from, TI, SGS and Fairchild. So most of these ideas with which i design opmaps were learning that came from their application notes and datasheets. So read them and then you can understand these circuits. AN-20: An Application Guide for Op Amps PDF AN-31: Op Amp Circuit Collection PDF 741 Op-Amp Tutorial, op-amps, Operational Amplifier Op-amp Varieties OPERATIONAL AMPLIFIER BASICS by Harry Lythall When such wonderful pages are there, there is no point in me explaining the same thing. I am not so good at that. So i do my circuits and you study these links and understand. |
