A High Current Pulsed LED
Using this circuit will create a very sharp high current pulse to an LED
at various Frequencies, depending on R1 and C1.
Reducing the value of the C1 will increase frequency and Visa Versa.
With the values shown, and a 20 Volt supply, the Frequency is aproximately
10Khz and the current is about 525 Ma.
Reducing R1 to 2K4 and a supply voltage of 10 Volts the Frequency is
aproximately 20 Khz and the current is about 180 Ma.
With R1 still at 2K4 but changing C1 to a 1.5 Mfd, Changes the Frequency to
770 Hz and increases the current to about 280 Ma
Reducing the value of R1 will allow for lower operating voltages.
Reducing the value of R2 will increase current to the LED. Additionally
R2 can be a potentiometer for continuous current control.
Other SCR's will work but will may require some part value changes.
Because these are such sharp spikes, the current needs to be measured
with an oscilloscope that has been calibrated and connected across R2.
By knowing this voltage drop and the resistance of R2, the Amperage through
this resistor and the LED, can now be calculated.
LED Currents up to 10 amps may be achieved with this circuit.
Additionally: Other SCR's will work but will may require some part
*Copyright © 2003*