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tlfong01
tlfong01
3:11 AM
Troubleshooting the OP's random unstable duty cycle problem.
ONe way is to use a simple configuration with fixed 50% duty cycle, in case the OP do not have any requirement on duty cycle.
NE555 Adjustable Resistance Generator Module Pulse Frequency Duty Cycle Single Channel Square Wave Output NE 555 Module DC 5-12V - AliEx HKD3
https://es.aliexpress.com/item/32991853673.html?spm=a2g0o.search0304.0.0.2ef478945Atn7j&algo_pvid=38d46c14-1eaa-4267-9df6-a034a5b27ed5&algo_exp_id=38d46c14-1eaa-4267-9df6-a034a5b27ed5-21&pdp_ext_f=%7B%22sku_id%22%3A%2266889262344%22%7D&pdp_npi=2%40dis%21HKD%21%212.9%212.9%21%21%21%21%40210318c216608781398155522e6b8c%2166889262344%21sea&gatewayAdapt=glo2esp
For this dirt cheap module, pot resistance is 105 = 1 M ohm, C = 104 = 0.1u. So frequency = 0.722 / RC = 0.722 / (1m * 0.1u) = 0.722 / 0.1 =< 7.22Hz.
 
tlfong01
tlfong01
3:46 AM
In case the OP needs to adjust both frequency and duty cycle, he may consider the following also dirt cheap HK$3 module:
YS-32 NE555 Pulse Frequency Adjustable Duty Cycle Square Wave Rectangular Wave Signal Generator Module - AliExpress HK$3
https://es.aliexpress.com/i/33018913622.html?ws_ab_test=searchweb0_0%2Csearchweb201602_0%2Csearchweb201603_0%2CppcSwitch_0&algo_pvid=5081cf55-7f5f-4af2-9845-5e49f0616961&algo_expid=5081cf55-7f5f-4af2-9845-5e49f0616961-25&gatewayAdapt=glo2esp
 
tlfong01
tlfong01
4:13 AM
 
tlfong01
tlfong01
4:32 AM
The OP might also like to replace NE555 by HC14.
74HC14; 74HCT14 Hex inverting Schmitt trigger - Nexperia 2021Aug
https://assets.nexperia.com/documents/data-sheet/74HC_HCT14.pdf
 
 
3 hours later…
tlfong01
tlfong01
7:47 AM
YS-23's frequency and duty cycle cannot be independently adjusted, ie, adjusting duty cycle affects adjusted frequency. To independently adjust frequency and duty cycle, the OP may consider Electronics Tutorial's improved oscillator design, using two extra pairs of diode and potentiometer.
 

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