Jake Hertz

1 week ago | forum.allaboutcircuits.com | Luke James |Jake Hertz

Hi, I am testing a 48W 220Vac-24Vdc flyback converter that I designed. I am trying to calculate the efficency of the converter but got stuck at what values to use. I measured the input current using a clamp meter to be 110mA and the input voltage to be 228Vrms. The output voltage is 24V and the current is A with an led strip as a load. I am using an LT3798 controller that includes PFC which I am utilizing so in my calculations I assumed a pf of 0.95.

1 week ago | forum.allaboutcircuits.com | Jake Hertz |Luke James

im modifying a dlp projector for use with a high power UV led light source. i appreciate that these big 100w leds are not very good for projector use as the light output is quite poor.. however i also assume that removing the colour wheel will compensate somewhat, i read somewhere that it increases the light output significantly. anyway my issue is tricking the projector into thinking it has a lamp.

2 weeks ago | forum.allaboutcircuits.com | Luke James |Jake Hertz

Hi all, another idea i need to judge the practicality of.. i need to control the intensity of a laser beam which will be scanned rapidly. obviously PWM is problematic since if the beam is moving, you see the pulses quite easily. cheap analog laser drivers exist, for example: https://shop.stanwaxlaser.co.uk/lovell-laser-diode-driver-677-p.asphowever they require an analog control signal on the input.

3 weeks ago | forum.allaboutcircuits.com | Luke James |Jake Hertz

I am working with a PMOS-based switching circuit where the PMOS turns on for 20 ms with a total period of 40 ms (i.e., a 50% duty cycle). In the schematic, there is a capacitor C1 and resistor R2 placed between the gate and source terminals of the PMOS. I'm trying to understand the following:What is the purpose of C1 and R2 between the gate and source of the PMOS? Will the circuit still function correctly without these components?

3 weeks ago | forum.allaboutcircuits.com | Jake Hertz |Luke James

Hi All, I'm working on a jig that will allow operators to quickly test different inductors before mounting to a PCB. The idea being the operator doesn't need to connect to individual pins, and perform multiple measurements. They can just insert the device and press a button to get a Go/No-Go.Is there any normal type of connections for test-connections of through-hole components? or different search terms I haven't thought of?