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Wanting to prototype something with an oddball push-pull 3.3V-to-13V switch led me to concoct an experiment using only stuff available at a reasonably well-stocked Radio Shack[3], with particular attention to ICs that provide push-pull outputs. So far I ve tried configurations based on the original 555 timer[4] and the TL082 op amp. My first experiments with the TL082 in Schmitt trigger configuration were not promising, but I m suspicious something may have been connected wrong; the logic low never went below 1.15V, which happens to have been the reference voltage, half of 3.3V. Either way, the supply voltage had to read 17.3V for a high output of 13V. In contrast, the 555-based Schmitt trigger appears to be a workable solution, as long as you can drive the chip 1.5V higher than the desired high output. This entry was posted in builds , Chips and tagged 555 , shifter .
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