How fast can a 555 timer oscillate? And what about the CMOS 7555?
By Julian
Youtuber, shed dweller, solar charge controller aficionado
Good morning all…
Youtuber, shed dweller, solar charge controller aficionado
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Not all 7555s are CMOS types. The LMC555 says 2.1MHz is its rated max.
What if we put a thermocouple on top the chip cool it down below zero and se what happens
The maximum stable operating frequency of a 555-like timer I have read about was 9.4 MHz. This frequency was achieved for the Micrel MIC1557 version in its SOT23-5 package with a blockig capacitor of 100 nF at voltages between 4.6 to 6.8 V without a timing capacitor and a resistor of 330 Ohm.
I see you are interested in electronics
I need a pulse generator circuit please. Exactly twenty hertz and the possibility of controlling the Duty Cycle
"Internal Capacitance" is the word you were looking for = 1.224pf
( the plastic Containers Capacitance ) .. Capacitance Coupling can also be used:
( twisted enamel 26 Gauge wires, bare at point of contact, and 3 mm long – twistinged tight. )
I wonder why they are so slow, doesnt make much sense.
You have quite a lot of overshoot and ringing there. That should produce a lot of overtones, so would it be possible to like attach a high pass after it and drive these overtones up with an opamp? What freq would that do?
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You know youre gonna have to do how slow can it go
"Thank You", thank you very much. My understanding of the IC555 tlmer is, it's frequently is "totally" independent of the supply voltage. Let me know. I look forward to hearing from you…
What is your oscilloscope you are using?
What is your oscilloscope you are using?
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When using a POT on the 555, it's always a good idea to put a 1k resistor in series with it. Otherwise when you turn it all the way down, the resistance will go to 0 and too much current will flow into your 555, thus cooking it. Also I think the reason it has a lower frequency with higher voltage is because of the way the SR latch is triggered when the voltage in the RC network drops to 1/3 Vin and rises to 2/3 Vin. With a higher voltage, there's a greater difference in voltage required. Ie for 12v it'd have to swing between 4v and 8v, for a total of 4v. Where at 5v it would only have to swing between 1.6 and 3.2 volts for a total of 1.6, so it takes much less time to trigger the comparators. To get a higher frequency, maybe put a 10pf capacitor in series with nothing to act like 2 caps in series with the wiring inside the breadboard, thus cutting down the overall capacitance.