Search found 7 matches

by compudel
Sun Dec 19, 2004 12:26 pm
Forum: General Discussion
Topic: Design Using Op Amp
Replies: 2
Views: 968

Re: Design Using Op Amp

Russ, I appreciate your reply, and please forgive me for not responding earlier. I was able to find the circuit in an Electrical Engineering textbook. The circuit is known as a "Howland" current source. It is actually a Voltage Controlled Current Source. In fact, I was able to discover it was covere...
by compudel
Wed Dec 15, 2004 9:45 am
Forum: General Discussion
Topic: Design Using Op Amp
Replies: 2
Views: 968

Design Using Op Amp

I am looking for a good circuit design analysis online of a Voltage-controlled current source (vccs) and a bridge amplifier using op-amps.<p>The vccs would be in the configuration of a feedback resistor and an input resistor that is referenced to ground, with their intersection wired to the invertin...
by compudel
Sat Aug 28, 2004 9:18 am
Forum: General Discussion
Topic: DVD Trouble
Replies: 7
Views: 2061

Re: DVD Trouble

Thanks for the feedback on the DVD problem. I agree with the two replies about the cost of parts and what is available today for the same money. This DVD is a Sony Model DVP-S560D, and as usual, Sony typically add future enhancements that you don't find in low cost sets. The DVD player hasn't been u...
by compudel
Sat Aug 28, 2004 9:14 am
Forum: General Discussion
Topic: DVD Trouble
Replies: 7
Views: 2061

Re: DVD Trouble

Thanks for the feedback on the DVD problem. I agree with the two replies about the cost of parts and what is available today for the same money. This DVD is a Sony Model DVP-S560D, and as usual, Sony typically add future enhancements that you don't find in low cost sets. The DVD player hasn't been u...
by compudel
Wed Aug 11, 2004 6:04 am
Forum: General Discussion
Topic: DVD Trouble
Replies: 7
Views: 2061

DVD Trouble

I have a Sony Model DVP-S560D which displays the message "NO DISC" when I install a DVD Disc. I assume this means that something is out of alignment and the optical reader can read the disc. Maybe the optics has become defective? Any suggestions on what I can do to restore the system or realign the ...
by compudel
Sat Jul 17, 2004 7:16 am
Forum: General Discussion
Topic: Oscilloscope Setup
Replies: 6
Views: 1519

Re: Oscilloscope Setup

Thanks for the feedback, but I do have the oscilloscope connected to an isolation transformer. The isolation transformer is 120V/120V(US) with a three prong plug.The earth ground lead is passed from the isolation transformer to the scope chassis. If I use a two prong adaptor on the scope ac power co...
by compudel
Fri Jul 16, 2004 8:03 pm
Forum: General Discussion
Topic: Oscilloscope Setup
Replies: 6
Views: 1519

Oscilloscope Setup

I am trying to setup an oscilloscope to view waveforms on a television receiver. The television has a switching regulator power supply with the input waveforms on the chopper transformer as well as the voltage regulator referenced to signal ground (hot), while the output waveforms on the chopper tra...