Recent content by TChi

Hi, For my frequency divider, I found out a divide by three circuit based on the 555 timer here: http://www.national.com/ds/LM/LM555.pdf -> It is good enough for me. To Mike_In_Plano: thank you for your idea about the stabilization of the output of the amplifier. It's worthy and I will...

Thanks for your suggestions. Would you please tell me your recommendation about the Piezo application? About the frequency divider, the 1 kHz is the given frequency that I could not alter it. However, I tried to use the counters as you said and I got some good frequencies. I will try more...

Dear vk6kro, Thank you for your message. About the high voltage amplifier, maybe you said in a fast way so I could not catch you. If I understand what you suggested correctly then by using two TDA7294 amplifiers, I can get ±40 V for each amplifier and double it to get 160 V (peak to peak) by...

Hello everyone, I could not find the solution for my problems by searching the forums. Thus I am writing them here so would you guys please help me. There are two problems but it is not good to create two topics for this so I combine them here: 1. High Voltage Amplifier: We often work...

Dear Bob S, This is very clear and this will be a practical solution for me. However, please tell me again about the references, textbooks or articles, etc that I can gain more knowledge of this field. Since I want to learn and design it myself in case the real problem is different than the...

Hi Bob S, Thank you so much. What you said is exactly what I am trying to understand. Please do me one more favor: please give a reference list or a name of a book or whatever you think that I can read and learn more about this. I have only the fundamentals of electronics. Please just give me...

Dear Bob S, Thank you for your messages. You were definitely right. What I want is to measure the number of photons that come to the photodiode. However, I am lack of knowledge in this specific topic. Would you please give a reference or any typical electric circuit to get into reality. I...

Hi Bob S, Actually, the original pulse duration in my case is 30fs, the 1ps value is the stretched one. Even if we use the photodiodes as you suggested, do you think that we can gauge the light intensity by the photodiode current? Please let me know, I am not quite clear here. What decides...

Hello everybody, When I came up to my problem, I searched all over our forum but I could not find the appropriate solution. Would you please help me: 1) http://home.sandiego.edu/~ekim/photodiode/pdtech.html#resp is the description about the response time of photodiodes and I can find the...

Dear 0xDEADBEEF, Thanks for your comments, you gave me several good ideas. Certainly I should put more effort on this problem. I am working on this one and whenever I solve it, I will let you know. To vk6kro, negitron and MATLABdude, thank you for your helps!

Hi vk6kro, Maybe it's my fault to did not tell you clearly my requirement: Assume that my crystal is controlled with the high voltage of around 6kV and that voltage will be kept the same for a long time. I can change that voltage by adjusting the knob (in my opinion, that knob does not...

Hey, mishal, This is the simple solution to your problem: x = -20:0.01:20; y = x.^2 + 2*x + 3; plot(x,y); You can copy and paste this into your Matlab Command Prompt. If you need more information, feel free to ask me. By the way, you can search Matlab Help, that's very good source for self...

Hello everyone, Dear vk6kro, actually I contacted the manufacturer's technicians but they regretted that they could not help me. To dlgoff: you are completely right, I am using Kerr effect to adjust the lasers intensity and we want variable DC output from our controller. Could you give me any...

Hi all, I am sorry that I did not tell you clearly the devices I am working on just because I don't want you to be confused by too many things and just focus on my problem. Here is it: Pulse Gating System: its model is 5046ER, as you can see in http://www.fastpulse.com/pulse.php" We are...

Dear vk6kro and 0xDEADBEEF, These are my pictures: http://img90.imageshack.us/img90/9943/insidee.jpg I made some explanations, as you can see from this picture. I magnified it http://img238.imageshack.us/img238/7231/0907300001.jpg This is the front panel...