@LIiutaio i bet your transistor is dead, R1 is very small OR internal transistor of 555 pin 7 is toasted... Or you got the circuit wrong. The circuit has 0-99.9% range
PCB Heaven, can I use this exact circuit but with a higher capacity transistor (like 10 A , 75W heat dissipation capacity), to power nichrome wire, and in process control the heater?
Just built this for use with a 300 led light strip. (Thank you by the way.) The max output is drastically reduced by this circuit. When the pot is at least resistance, is the duty cycle near 100% ? If not, what can be changed in the circuit to get as close to 100% as possible. I am considering a SPDT switch with a DIMMER ON - OFF - DIMMER BYPASSED setup. Is this my best option?
God damn it, i love your accent. Just came here to remember how to build a PWM circuit using 555 timers. I want to control a powerfull RGB LED ;) Think ill need 1 PWM per color.
Do you know any software for designing circuits like Edison?
askk1996 1 month ago
This circuit don't have a 0% to 100% range!
The LED don't off!
LIiutaio 1 month ago
@LIiutaio i bet your transistor is dead, R1 is very small OR internal transistor of 555 pin 7 is toasted... Or you got the circuit wrong. The circuit has 0-99.9% range
pcbheaven 1 month ago
PCB Heaven, can I use this exact circuit but with a higher capacity transistor (like 10 A , 75W heat dissipation capacity), to power nichrome wire, and in process control the heater?
mamatalu 2 months ago
Just built this for use with a 300 led light strip. (Thank you by the way.) The max output is drastically reduced by this circuit. When the pot is at least resistance, is the duty cycle near 100% ? If not, what can be changed in the circuit to get as close to 100% as possible. I am considering a SPDT switch with a DIMMER ON - OFF - DIMMER BYPASSED setup. Is this my best option?
isaacinnis 2 months ago
@isaacinnis it is 100%, but i suppose that the driver you use for the LEDs cannot provide enought current.
pcbheaven 2 months ago
God damn it, i love your accent. Just came here to remember how to build a PWM circuit using 555 timers. I want to control a powerfull RGB LED ;) Think ill need 1 PWM per color.
RavenRof 4 months ago
Can drive 6 leds in series at 1 A?
sangms1959 6 months ago
awesome stuff, thank you very much!
RavenRof 7 months ago
Do you think it would be possible to dim a 230 volt par 38 led lamp ?
bermudarailway 7 months ago
@bermudarailway nope
pcbheaven 7 months ago
Very good video my friend!
kamelhmmvafan 8 months ago
hey..great video..was wondering how to control this circuit ( dim % ) with a PIC controller.
Scartr 11 months ago
@Scartr i have some circuits (for PC fans) in my site.
pcbheaven 11 months ago
@pcbheaven thanks...
Scartr 11 months ago
@pcbheaven can the brightness be controlled by varying the supply voltage?
Scartr 11 months ago
@Scartr yes, but you do not this circuit. a simple potentiometer that will vary the voltage from 2.8 to 3.4v can vary the brightness
pcbheaven 11 months ago
If I were making a circuit like this, but the total current running to my LED array were around 5A, what transistor should I use?
anearey 1 year ago
@anearey use a mosfet like the IRF520
pcbheaven 1 year ago
@pcbheaven does the 555 chip allow for current that high? it looks to me that it will only output a maximum of 200mA
anearey 1 year ago
@anearey the 55 will drive the IRF, and the IRF will drive the LEDs. The IRF540 can control up to 9A
lazaridisgeo 1 year ago