Recent content by sparkyyyyy

I would like to thank both geekEE and Noway2 for taking the time to respond to my post. I appreciate it. I found several things and now my circuit is working well. I had to use thick bus wire to extend my ground close to the chips plus and minus supplies. Also even though I was only driving...

Hello, I was wondering if any of you have used an OPA2690 in the unity gain configuration. I followed the data sheets suggestions of using a 25 Ohms resistor in between the output and inverting input to isolate the input capacitance from the output. I also followed the suggestions of a 50 Ohm...

Thank you for your input. Have a great day. Thank you, George

Hello, I am using a ICS552-02 clock buffer with a 33 Ohm resistor in series (manufactures suggested 33 Ohms) to drive a DAC904 D/A converter at 100 MHz. The power supply for both the ICS552-02 and DAC904 are 3.3 Volts. The logic threshold for the DAC904 is 1/2 supply voltage which is 1.65...

Hello, I need some ideas on how to have have a Mini ITX computer send out a "power on" signal to my other instrument. I want the Ethernet to communicate with the computer and tell it to send a signal to a auxillary power supply to turn it on. Thanks,

Hello, Does anyone have a recommendation where I can find some good free information on all of the parameters dealing with switching power supplies. I am also interested in any good books on the subject. Thanks, sparkyyyyy

Hello I just posted a question dealing with a DDS chip and I forgot to indicate that I need I and Q sinewave outputs. Thanks, Sparkyyyyy

I have a low power application. I need to find a direct digital synthesizer (DDS) that will have the following attributes: 10 Hz to 2 MHz sinewave Low power ( would like this to be under 500 mW) I have looked at the AD9854 DDS chip, but this draws too much power. Any help you can give me...

Hello to everyone who responded to my post. Thank you for taking the time to offer suggestions to my problem.

Hi cbarn24050, I appreciate all of your help. This is the approach that I am going to take.

In a previous email I indicated that the incoming frequency could be 50 or 60 Hz. When I think of using a PIC, I think of using a counter to delay my output after so many clock cycles of the PIC. For example, I would delay a certain number of clock cycles(PIC Clock =2 MHz or some other value)...

Hi cbarn24050, Thank you for your input. I will try to see if I can find someone to program a PIC for me. I have not done this myself. Thanks again.

Hi cbarn24050, This product will go into production.

Hello, Thank you all for your suggestions. I will need a 90 +/- 1 degree quadrature signal. I do not have a CPU in my circuit. I must also admit that I am not sure how to use a CPU to accomplish a 90 degree phase from my sync signal. I used the phase locked loop concept, I think my 90...

Thank you fjrg76 I am not sure how to apply the quadrature encoder to my problem. I don't generate the 60 Hz signal. I just need to synchronize to it. Then generate both in phase and quadrature signals that are synchronized to the incoming signal. Thanks,