Hello all,
I seem to recall having a schematic for one roughly 20 years ago, but there have been several hard drive crashes and at least one plumbing "flood" since then.. and I can't seem to re-locate it online.
My goal is to externally trigger square wave pulses (of variable frequency say from 20-22000 Hz) with a 555 timer circuit using a function generator/laptop/tablet/etc. Most of the schematics I have found show 555 pins TRIG 2 & 6 joined together for astable square waves.
Is this an internal IC connection or just a common way of externally wiring the 555 for astable mode?
Ideally, I would like to keep my output voltage fairly close to the maximum 15 VDC input (and I'm wondering how duty cycle would impact this goal). Also, I am looking to software control a 555 square wave oscillator, not "set" a hardware output frequency.
I seem to recall having a schematic for one roughly 20 years ago, but there have been several hard drive crashes and at least one plumbing "flood" since then.. and I can't seem to re-locate it online.
My goal is to externally trigger square wave pulses (of variable frequency say from 20-22000 Hz) with a 555 timer circuit using a function generator/laptop/tablet/etc. Most of the schematics I have found show 555 pins TRIG 2 & 6 joined together for astable square waves.
Is this an internal IC connection or just a common way of externally wiring the 555 for astable mode?
Ideally, I would like to keep my output voltage fairly close to the maximum 15 VDC input (and I'm wondering how duty cycle would impact this goal). Also, I am looking to software control a 555 square wave oscillator, not "set" a hardware output frequency.