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  1. D

    back to back zener diodes does what?

    symmetrical clipping but only on the feedback loop? The other circuit symmetrically clipped the output of the op amp What is the difference between symmetrically clipping the feedback loop compared to symmetrically clipping the output?
  2. D

    back to back zener diodes does what?

    So what does these back to back diodes do?
  3. D

    Transistors switch on output pin or input pin

    I'm not sure what makes the difference of having these FETS on the output pins If I remove the FETS on the output pins, what would make the difference? It seems like the FETS don't do much. Besides turning on and off PICTURE#1 U5 has Q6 FET on the output, if i remove the FET what would be...
  4. D

    Positive and Negative regulators sections are different

    Here is series pass transistors that are back to back for the Positive supply and Negative supply Take a look please This circuit has a name, it's in my Floyd electronic book i will look it up
  5. D

    What kind of relay is this?

    Here is another Relay RC network suppressor circuit This RC doesn't have the Series diode, so what happens now?
  6. D

    What kind of relay is this?

    Here the schematic clip of the Relay RC network with the Series Diode we are talking about The Capacitor stores the relays voltage and the 100 resistor drains off the coils slowly sinking it back to the power supply The Series Diode blocks the capacitor from draining the voltage and current...
  7. D

    What kind of relay is this?

    Steve here is some schematic clips with relays RC networks and an relay driver Relay Driver has a FET Q2 , a transistor driver Q3 Most driver circuits don't have the FET, they just go direct to the transistor driver The transistor is to output more current to the relay coil to energize it...
  8. D

    back to back zener diodes does what?

    I found another back to back zener diode on the op amps input pin These diodes must clamp or clip the waveform symmetrically
  9. D

    Test Fixture patch bay Diodes?

    Harald kapp here is the pictures of the patch bays on the test fixture Also I don't know the names of the size of the red and yellow patch bay cables and plugs are called, do you guys know? But each jack on the patch bay has a series diode soldered to the jack to a wire that does to the...
  10. D

    back to back zener diodes does what?

    So they can have the same RC values? so how can you tell which is which? if you don't know what the input waveform is either AC or DC How would a tech know by looking at a schematic
  11. D

    Comparators with diodes on the output why?

    How can a 741 op amp source current? The diodes are in series , so how can a diode in series sink current? I can understand if the diode was in parallel with the output, it would sink the output I'm confused about how it's sources or sinks current Since op amps aren't open collector...
  12. D

    Diode on Pin1 and Pin8 on Opamp, does what?

    So what is the diode there for? The diode is doing what to the comparator?
  13. D

    back to back zener diodes does what?

    How can you tell from a Low Pass filter to an Intergator? they both look the same to me Is it the Capacitor and Resistor values that make the difference? I can't tell on schematics if it's a low pass filter or an intergator circuit Any hints to know without knowing the input waveform is AC...
  14. D

    Diode on Pin1 and Pin8 on Opamp, does what?

    What does this diode do on pin#1 and Pin#8 on this Op-amp? Mostly I see a capacitor on Pin#1 and Pin#8 for frequency compensation Are they using the capacitance of the diode? Take a look please
  15. D

    back to back zener diodes does what?

    I was thinking that also but, isn't U27 a comparator? So U27 is not outputting an AC waveform i'm thinking U24 is an intergator
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    Positive and Negative regulators sections are different

    I was guessing the same as you
  17. D

    Positive and Negative regulators sections are different

    oh ok thanks for clearing that up Ok i get it But what about Q17? what does it do Q6 and Q17 is a current pass transistor circuit it seems that outputs more current only in the negative supply compared to the positive supply
  18. D

    back to back zener diodes does what?

    What does these back to back zener diodes do? Why are the reverse polarity back to back?
  19. D

    Comparators with diodes on the output why?

    So the voltages don't add or the current add when the 2 outputs are HIGH? I guess since both outputs are at the same potential they don't add together
  20. D

    Comparators with diodes on the output why?

    Yes I understand So both comparators outputs can be HIGH and it won't short out? or damage the output stage internally of the op amp? Now I do see how the diodes are a OR, when you "TIE" both outputs of op amps together
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