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LED Flyback Circuit
I'll try to analyze the circuit by referring to AN4137. I really confused on this thing and need some guide. I still learning about power electronic. Could you please help me?
In the AN4137 example, it connected the opto-coupler at two point. I want to let the variable...
LED Flyback Circuit
Anybody, need help at least could anybody tell me whether the connection of my optocoupler is correct or not? should I connect it to the Feedback of TL5001 or VCC. I've searched the forum but still confused.
Hello to everyone,
Currently I'm designing LED drvr cct. The specs for my design are as follow:
*********************************
Vin = 100 - 240 V
Vo = 20
Po = 100...
capture problem orcad
Anybody have the idea? If I just make like the picture, when transfering the netlist into layout, there will be two 74HC164. Is there a way to make it to be only one 74HC164?
I don't want to unhide the power pin because there are 5 of them and it will be messy to unhide...
capture link
Hello everybody,
I'm currently learning using orcad capture. I've a problem on making some kind of link between chips. What I mean is I want to make new part which represent pins for power and ground of the chip and that part work like an alias. May I know how to do it? I've tried...
VHDL on Apex20K
Hello to all,
I’m newbie in VHDL programming on FPGA. I need help from all of you out there. Right now I try to write a code for 2-digit BCD down Counter, LCD display message and synchronization between both of them.
For 2-digit BCD down counter, here’s my code
library IEEE...
Re: Modem
Thanks for your reply banjo. for case 3, vcc after been regulated is 5v. that's mean base current = (5-0.7)/10k = 0.43mA. Before that may I know how to find the beta value for this 2N4401 since in its datasheet beta value vary with Ic and Vce. May I know what is the resistor value...
Modem
I need to construct simple infra red modem. the schematic is like below.
After constructing it on breadboard, I think I got few new ideas to enhance it but I need some advice from the expert.
**broken link removed**
For case
1: I think I would lik t replace all of the component with...
Re: Radio Shack Special
Audioguru,
After finishing my project and report, my friend asked me why I'm not using variable diode sice it is easier to tune variable diode than my plastic varicap which required screw driver to tune it. Is it ok to replace my 15pF varicap with variable diode and if...
Re: Radio Shack Special
Audioguru,
Whe I was trying to make a report for this radio project I found out one thing that made me curious about voltage rating for the electrolytic capacitor. From the schematic of the author of this RSS, it sad that voltage rating for the electrolytic capacitor...
Re: Radio Shack Special
Audioguru,
Is there any other thing I can do to improve this circuit, I mean in term of minimizing the noise? I've increase the capacitor value and still thinking is there any other thing to improve my circuit.
Re: Radio Shack Special
If you don't mind can you please give me manual about this thing, I mean the formula. What about pre-emphasis of FM broadcast around Asia region? If my calculation is right, if I want the pre-emphasis to cut above 3500Hz, I need to increase the capacitor value to...
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