This is a small sawtooth (almost) oscillator circuit which I have been tweaking the last weeks to generate a reasonably decent 100kHz waveform at Vcc=5V. It was based on some random schematic on the web, which didn't generated the output from 0V to Vcc, so I added a few more components and changed a few parts.
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| Circuit schematic |
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| Assembled circuit |
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| Oscilloscope signal capture |
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Basically it charges a capacitor (C1) and uses the 555 comparators to trigger the discharge via other PNP transistor(Q2). The triggering voltage is calibrated with the POT_2 and the capacitor fill time is calibrated with the POT_1.
It has a few glitches which didn't appeared on the simulation and neither on the breadboard(parasite capacitances FTW), but I also used some BC560 instead of the BC557.
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