555 simple - This HomeRun - Probably only use Sq Wave Gen

 https://www.youtube.com/watch?v=VurDwrtTF3g&t=502s

Falstad 111924_simple555

smaller cap incr freq

incr pot incr Duty Cycle !!

Pin 5 tie Grd 100nf cap

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DC	f	R1	R2	C	1nf	nf
60%	144	100,000	200,000	0.00000002	0.000000001	2
67%	160	150,000	150,000	0.00000002	0.000000001	2
67%	160	150,000	150,000	0.00000002	0.000000001	2
67%	32	150,000	150,000	0.0000001	0.000000001	100
67%	6	150,000	150,000	0.0000005	0.000000001	500
67%	3	150,000	150,000	0.000001	0.000000001	1000
52%	3,429	1,000	10,000	0.00000002	0.000000001	2
67%	4,800	5000	5000	0.00000002	0.000000001	2
67%	192,000	5000	5000	0.0000000005	0.0000000005	0.5
The highest frequency achievable with a 555 timer in astable mode is typically around 500 kHz

The frequency for a 555 timer in astable mode with a capacitance of 50 nF and resistance of 20 kΩ is 480 Hz.

The frequency of a 555 timer in astable mode can be expressed as a function of the capacitor C and resistors R1 and R2. The formula for the frequency is:

f = 1.44 / ((R1 + 2R2) * C)

Where:

- f is the frequency in Hz

- R1 and R2 are resistances in ohms

- C is the capacitance in farads

This formula shows that:

1. Frequency is inversely proportional to capacitance C. Increasing C will decrease the frequency.

2. Frequency is inversely proportional to the sum of R1 and 2R2. Increasing either resistor will decrease the frequency.

3. R2 has a greater impact on frequency than R1 due to the factor of 2 in the formula.

To adjust the frequency:

- For lower frequencies, use larger values of R and C.

- For higher frequencies, use smaller values of R and C.

It's important to note that very high frequencies (above 100 kHz) may be difficult to achieve reliably with a standard 555 timer due to internal delays and parasitic capacitances[1][4].

The duty cycle of the output waveform is determined by the ratio of R1 and R2:

Duty Cycle = (R1 + R2) / (R1 + 2R2)

To achieve a duty cycle close to 50%, R2 should be much larger than R1[4][5].

Citations:

[1] https://learnabout-electronics.org/Oscillators/osc43.php

[2] https://circuitdigest.com/calculators/555-timer-astable-circuit-calculator

[3] https://www.electronicdesign.com/technologies/analog/article/21252714/electronic-design-the-origin-explanation-and-applications-of-triple-five-timers

[4] https://www.circuitbasics.com/555-timer-basics-astable-mode/

[5] https://www.electronics-tutorials.ws/waveforms/555-circuits-part-1.html

[6] https://www.allaboutcircuits.com/tools/555-timer-astable-circuit/

[7] https://www.electronicsforu.com/technology-trends/learn-electronics/555-timer-working-specifications

[8] https://circuitdigest.com/electronic-circuits/555-timer-astable-multivibrator-circuit-diagram

[9] https://www.electricaltechnology.org/2014/12/555-timer.html

[10] https://www.electronicshub.org/astable-multivibrator-using-555-timer/