Hello
This circuit switch between two outputs and reset
I mean one click for lower button turn on the lamp, another click turn off different lamp, another click turn off both
I'm fine with this process, as I've already simulated and it work

My problem here, that I need control the lamp brightness with buttons, " the upper right and left",
The control work, and the voltage drops across the lamp when dimming, but when Release the button, the voltage start increase again across the lamp slowly and lamp start shine again
I've tried different capacitors, but same issue, only time change but not solve the problem
When simulate the irfz44n circuit alone, it work perfect,

when merge with 4017 circuit problem happens
How can I adjust the lamp dimming, and prevent capacitor discharge after button release?

 

Of course the lamp will get brighter as time passes. With neither button pressed the gate circuit is floating and there is a positive bias on the capacitor. So of course the gate will have a slowly increasing positive voltage.

Did the TS draw the circuit to intentionally make it hard to follow?? The lines are a lot more complicated than the actual circuit.

 

when merge with 4017 circuit problem happens
How can I adjust the lamp dimming, and prevent capacitor discharge after button release?

Try this version.
M1 requires heat sink!


EDIT: Changed mosfets to IRZF44N, lower Rds.

 

I see no "pull up" resistor for the drain voltage of M1, the added device. That may cause a problem.
Really, the solution is to use a ZERO LEAKAGE capacitor for that 0.1 Uf capacitor. Otherwise, the function will be very similar to the "time dependent light dimmer" in my old GE hobby circuits book.

 

I see no "pull up" resistor for the drain voltage of M1, the added device. That may cause a problem.

Doesn't need a pullup resistor.
I tested this circuit using a 0.47uf/ 400v polypropylene film capacitor and set the drain at 4.27 volts. It was still holding after 10 hours.

 

Try this version.
M1 requires heat sink!

Can not use the smd package?, as the space so little, only for smd

 

Can not use the smd package?, as the space so little, only for smd

Still requires a heatsink.
How much current does that LED strip draw?

 

Still requires a heatsink.
How much current does that LED strip draw?

The one led strip consumes about 2A

 

Somewhere between 6 to 9 watts worst case per LED strip.
Needs heat sink.

 

This require heat sink also?


I've tried this circuit, everything OK except :

1- there is delay time when switch from one led strip to the other, take time to completely off while the other strip is on

2- when increase the brightness, the led not fully bright, duty cycle doesn't reach 100%

 

I didn't have those problems on my bench test.
Did you actually construct the circuit or just a simulation?

 

Just simulation

 

If I use microcontroller, is it still need heatsink?

 

By the way, as you see that the space I have
13mm*100mm pcb
No place for heat sink
need change the design to micro-controller?, with mosfet for each led strip?, suitable one smd without heatsink?

 

Micro has nothing do with needing a heat sink.
It depends whether the circuit is operating linear as in post #3 or PWM as in post #10
The circuit in post #10 may not require a heat sink or maybe only a small one
When high current passes through the mosfet some loss in dissipated as heat. Depends on the mosfet and how much current.
The IRF520 for instance has an average RDs of .27 ohms when fully ON. A 2amp LED strip would drop .27 x 2 = 0.54 volts. Now multipy that by 2 amps = 1.08 watts for 1 strip or 3.24 watts for 3 strips when fully ON
There are better mosfet to use. Back in post #3 I changed the mosfets to a IRFZ44N which has a RDs of only .035 ohms
Again: .035 x 2 = 0.07 volts x 2amps = .14 watts and .42 watts for 3 strips. Probably don't need a heat sink or possibly a small vertical type.
Simulation isn't always accurate. I have the circuit breadboarded currently and it works as designed.
Did you use the same parts listed on the schematic in the sim?

 

Use a mosfet with RDS(on) of 50m ohms or less, then the mosfet will barely even get warm, if at all.

 

By the way, as you see that the space I have
13mm*100mm pcb
No place for heat sink
View attachment 337081need change the design to micro-controller?, with mosfet for each led strip?, suitable one smd without heatsink?

Why does it have to be 13x100mm?

 

Why does it have to be 13x100mm?

Because it's the project requirements, the case is done, and now the PCB, and that's the only space available

 

Try this version.
M1 requires heat sink!
View attachment 337043

EDIT: Changed mosfets to IRZF44N, lower Rds.

This one work so good, no solutions for the M1 mosfet heatsink?

 

Can I use this mosfet?
A03400a