So,if you are very low,or almost out of small-signal diodes,and you need two for a clipping circuit,and you have lots of bipolar transistors,try using them as diode substitutes. I have done some experiments using the B-E junction of bipolar transistors as diodes,the resulting waveforms are rounded rather than sharply clipped. Since the B-E junction of Bipolar Transistors are effectively diodes,you could even use these as well,they happen to have an exponental turn-on characteristic,this was employed in Analog Synthesizer Exponential Converter circuits to convert the linear response of monophonic keyboards to an exponential current change which was used to control Voltage Controlled Oscillators,so that for each 1-Volt increase in control voltage,the VCO frequency doubled. I'd imagine so,you could even try using two back-to-back Zener diodes too. IIRC, Schottky diodes are available in a range of different Vf right? Similar to the way Zeners are? 3V forward-bias voltage,but they were silicon types. DrNomis wrote:I tried a couple of back to back small-signal Shottky Diodes once,I set them up on my breadboard,and used them to clip the signal from my signal generator,i half-expected to see a squarewave on the Oscilloscope screen,but instead I saw a gently rounded waveform,similar to what you get with two back-to-back germanium small-signal diodes,the Shottky diodes I used had a.
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