Timeline for 2-channel dimmer from NE555 + LM358?
Current License: CC BY-SA 4.0
9 events
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| Feb 4, 2020 at 21:21 | comment | added | nootnootmachine | @Yehor yes that is fine as long as you put in a resistor to limit the current. The output in 40mA from the opamp so if you put in resistor between the opamp and transistor so it dosnt get above 40mA you will safe gaurd the opamp. Assuming 5V coming out of the op-amp. 5 / 40mA = 125 ohms minimum. | |
| Feb 4, 2020 at 21:16 | comment | added | nootnootmachine | @Transistor thanks for your help | |
| Feb 4, 2020 at 15:40 | comment | added | Araneus0390 | Thank you! I also found a similar module but it doesn't have a transistor before MOSFET. The output of LM358 is directly connected to MOSFET. Is it safe or it should have a transistor? | |
| Feb 4, 2020 at 15:38 | vote | accept | Araneus0390 | ||
| Feb 4, 2020 at 8:28 | comment | added | Transistor |
@nootnootmachine, MathJAX tip: use \times for multiplication. In regular post text you can use × HTML entity along with &Omega', ω, μ, etc. (but it doesn't work in the comments).
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| Feb 4, 2020 at 6:53 | history | edited | JRE | CC BY-SA 4.0 |
edited body
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| Feb 4, 2020 at 5:29 | comment | added | Jasen Слава Україні | swapping the inverting and non inverting inputs for the second channel will reduce the amount input of current ripple (vs having them the same) wire the potentiometer backwards to compensate. | |
| Feb 4, 2020 at 5:22 | history | edited | Jasen Слава Україні | CC BY-SA 4.0 |
added 18 characters in body
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| Feb 4, 2020 at 4:44 | history | answered | nootnootmachine | CC BY-SA 4.0 |