# High power Square wave Signal

#### golanido

Joined Dec 19, 2018
6
HI all,
I am interested in producing a 24V 50W Square wave signal in the range on 20Hz-500Hz with a duty cycle in the range of 10-90%.

I have seen many signal generators that produce a square wave in the range that I want but with a very low power.
My knowledge in electronics is very limited, I don’t want to start soldering components, I am looking for off the shelf product that can produce the wave that I want or a product that can amplify a signal generator.

Any help will be appreciated

Joined Feb 20, 2016
3,909
What is your application?
At those levels and frequency you will run a great risk of generating significant radio interference is not correctly shielded.

#### golanido

Joined Dec 19, 2018
6
I want to flash LED's at these frequencies,
I am growing microalgae, according to researches there is a significant increase in the growth rate with flashing light.

#### LesJones

Joined Jan 8, 2017
3,497
If the LEDs have built in driver circuits they may not respond fast enough.

Les.

#### golanido

Joined Dec 19, 2018
6
Hi Les,
The LEDs are just LEDs without a driver.

Thanks

#### Danko

Joined Nov 22, 2017
1,134
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#### golanido

Joined Dec 19, 2018
6
Wow thanks, looks good.

#### golanido

Joined Dec 19, 2018
6
Use LED chip like US $4,10 DC 50W Cold White 6000-6500K High Power LED Lamp. Forward current = 4200mA, forward voltage = 12V. Using @24V put in series with LED resistor 3 Ohm, 75W (It may be piece of thick nichrom wire). It will inertialess light source. This light source can be drives by FET, controlled by US$3,31
Adjustable PWM Pulse Frequency Duty Cycle Square Wave Signal Generator Module.
Hi Danko,
I want to be sure that I understand everything,
Can you take a look at the diagram I drawn to see if this is the way you suggested?

Thanks

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#### Danko

Joined Nov 22, 2017
1,134
Can you take a look at the diagram I drawn to see if this is the way you suggested?
It is better to use 12V DC source for PWM generator (output will same 12 V).
Signal from generator should be connected between source and gate.
Use N-FET and change polarity of 24V source and LED.
EDIT:
In series with LED should be connected resistor 3 Ohm.
EDIT:
Look at this MOSFET module.
Then circuit:

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