Gregory's Serverputting the scope in XY mode gives you the actual VTC graph of output versus input. the X axis is the input voltage and the Y axis is the output voltage. the bottom left corner is 0,0.
|
10 comments
 74HCU04 devices can be used to build oscillators and even amplifiers! this snippet of the Snappy Video Snapshot circuit shows how they used a similar chip as an inverting op-amp to build an active low-pass filter! next up is the 74LS362. it is a clock generator. you connect a crystal or square wave source and it produces four non-overlapping phased clock outputs. there is a separate VDD rail that can handle 12V for level shifting the outputs. i think this part was used in the TI 99/4A. this is the 74LS624, which is a VCO (voltage controlled oscillator). i have no idea what it is doing in the 74xx series since it is totally analog!   @tubetime This is so interesting. Alot of guitar players use tube preamps because they like the sound. I wonder if this chip could simulate the transfer curve of a tube preamp. That would blow me away: seeing a digital chip as the input to a nice-sounding guitar preamp! @beeftacos a tube preamp's VTC actually folds back on itself. this creates 2nd order harmonic distortion. fascinating stuff. @tubetime Seriously? I didn't know that. Maybe that's where the unique electric guitar distortion sound originally came from? |
for contrast, this is the VTC of a standard 74HC04 (with buffering). the multiple stages of transistor inverters inside the chip sharpens up the transition region.