Solve Circuit Puzzle: 2 Current Sinks

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Discussion Overview

The discussion revolves around understanding the operation of a circuit schematic involving current sinks and a capacitor. Participants seek clarification on how the circuit functions, particularly the role of the current sinks and their interaction with the capacitor and other components.

Discussion Character

  • Exploratory
  • Technical explanation
  • Homework-related

Main Points Raised

  • One participant describes a circuit where a capacitor is initially charged and then interacts with two current sinks (VT16, VT17 and VT18) based on voltage levels at C15.
  • Another participant questions the completeness of the circuit diagram, noting the absence of signal sources, input/output terminals, and the purpose of a dangling capacitor.
  • A further contribution provides additional context about the circuit, mentioning connectors for sensors, a lithium battery, and the role of transistors in selecting sensors and amplifying signals.
  • There is a specific inquiry about how the current sinks discharge capacitor C18, indicating a need for detailed operational understanding.

Areas of Agreement / Disagreement

Participants express uncertainty about the circuit's operation and the completeness of the schematic. Multiple questions remain unanswered, and no consensus is reached regarding the functioning of the current sinks.

Contextual Notes

The discussion highlights limitations such as missing assumptions about the circuit's components and their connections, as well as unresolved details regarding the circuit's operation.

SAlex
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Hi to everybody!

I've next schematic, but i don't know how it's works in details.

The capacitor in the left upper corner is charged in the beginning. Then go 0-level to C15 and turn on first current sink (VT16 VT17). tnen 1-level to C15 turn off first sink. Then start works second (VT18).

Can u help me ?
 

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SAlex said:
Hi to everybody!

I've next schematic, but i don't know how it's works in details.

The capacitor in the left upper corner is charged in the beginning. Then go 0-level to C15 and turn on first current sink (VT16 VT17). tnen 1-level to C15 turn off first sink. Then start works second (VT18).

Can u help me ?

Welcome to the PF.

Is this question for schoolwork? I can move it to the Homework Help forums if it is.

What is the context of the question and this circuit? The circuit diagram is incomplete as far as I can tell. Where are the signal sources? Where are the input and output terminals? What is the load for the output? Where does the dangling cap at the bottom go?
 
That's full schematic in PCAD-2006 and image
 

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Brief description: connector XP1 (1,3,5,7 pins) is sensors. 21 and 23 - lithium battery. L1 through VT3 out pulses to corresponding sensor, which is selected by switch on transistors. Then out signal goes to amplifier, and needed level is detected by comparator. But i need to know how is working current sinks in right bottom corner. First sink on VT16, VT17 - and second on VT18. They discharge C18. Sorry for my poor english )))
 

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