DESCRIPTION. The LM and the LM are general purpose dual operational amplifiers. The two amplifiers share a common bias network and power. CC Datasheet, CC PDF, UPCC. Part Number, CC. Manufacturer, NEC. Short Description, UPCC. Long Description, www. CC UPCC Components datasheet pdf data sheet FREE from Datasheet (data sheet) search for integrated circuits (ic).
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Discussion in ‘ General Electronics Chat ‘ started by spinnakerNov 13, Nov 13, 1. Oct 29, 7, 3, I am trying to fix my Tek scope power -8 and power supply.
I suspect that the op amp in the circuit is bad. It is a CC. I really do not care if one of these is the best choice. Would one of these work for now? I am not great c148c reading datasheets. But would want to run ti by the folks here anyway.
CC Datasheet PDF ( Pinout ) – UPCC
I have included the PS schematic below. Here are my voltage readings for the -8 section. Nov 13, 2. Nov 16, 1, Bottom line, compare the datasheets of the op amps for compatability. Nov 13, 3. Apr 5, 18, 3, Nov 13, 4. Nov 13, 5. Nov 13, 6. Jul 17, 22, 1, I can’t seem to find a datasheet for a CC, but the pinouts on the schematic agree with the above opamps. Nov 13, 7. Nov 13, 8. You might find that one or more of the transistors connected to the output is shorted.
If the opamp is in a socket, why not try testing it on the bench? Nov 13, 9. Nov 13, Jan 28, 9, What voltage do you measure across capactors C and C? Actually the voltage measurement I would like you to make is the 1c458c across the terminals of the capacitor. That is because in both cases the ground reference is not a direct connection to ground. Just so that I am clear.
You placed your DVM probes on the negative and positive terminals of the capacitor and the voltages you posted are the ones you read.
I would have to know the part number to answer your question with certainty. In the meantime, I will use the values you have measured. I started reviewing the lessons on op amps on this site because I think the problem with my Tek scope power supply is a bad op amp. I went out a purchased a couple of op amps from Radio Shack and built a comparator like the first one on this page. C14588c have it working. Is this a good enough test for U A and B in t his schematic?
I could 1c458c ramp the voltages up to 15 VDC if that is recommended. First off it was probably not necessary to start a new thread since members are going to be a bit confused between the two. That can be remedied. As for the power supply, the opamp is actually being operated as an opamp rather than a comparator. The voltage you measured across C was around 15 volts.
The trick to the -8volt regulator stage is that Q is acting to control the positive-most end of the 15V secondary transformer winding so that it is exactly 7 volts positive when measured with respect to ground. If you imagine that the load on the -8V output increases then the -8volt output would drop slightly toward 0v.
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As the -8volts drops the positive input to the opamp begins to datahseet positive. This causes the output of the opamp to go positive datahseet drives the base of transistor Q which in turns drives the base of Q positive. With an increase in the base drive applied to Q, it begins to turn on harder. This action pulls the positive end of the transformer secondary supplying the 15V DC down slightly. This results in a restoration of the -8volt output so that the droop due to the increased load is cancelled.
Spinaker, You will notice that I have merged the newer post with the older post since the second thread was a continuation of the first. This will help prevent confusion since replying members will be less likely to be confused. Can I use a pen or mechanical pencil Dattasheet by coonsaa0 in forum: Can I use a flyback transformer in a forward topology?
Posted by spidermanIIII in forum: Posted by Gamedojo in forum: Can U use 2 transistors in place of a relay to switch 2 different voltages Posted c158c icadj in forum: Can we use a tristate buffer in place of voltage level shifter? You May Also Like: Motion-Activated Trail Camera In this Teardown Tuesday, we are going to take a look at the inner workings of a trail camera!
C1458C Datasheet PDF
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