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RS232 Booster
RS232 ports of modern laptops are not always complying with the original RS232 standard. If RS232 levels are expected to be +/- 12 volts, most of the time laptops RS232 ports produce in fact +/- 5 volts levels. For most peripherals, this is not an issue and they are responding as expected.
But some other will not act on a stable manner or not act at all. This is because they are expecting the original RS232 levels. One example of this problem is the use of a SKYSENSOR PC (Telescope controller) with a laptop.
There is a simple way to boost the RS232 weak levels, based on one of the most common RS232 IC (MAX232).
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Build your own LC Meter and start making your own coils and inductors. This LC Meter allows to measure incredibly small inductances making it perfect tool for making all types of RF coils. LC Meter can measure inductances starting from 10nH - 1000nH, 1uH - 1000uH, 1mH - 100mH and capacitances from 0.1pF up to 900nF. The circuit includes an auto ranging and "Zero Out" function to make sure the readings are as accurate as possible ... [more] |
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