Questions tagged [bipolar]
The bipolar tag has no summary.
113 questions
0 votes
0 answers
79 views
Measuring BJT Gummel Characteristics with Keysight B1500A: Do I Need Three SMUs?
I want to measure the Gummel Plot of a bipolar junction transistor (BJT) using a Keysight B1500A. My setup includes two medium-power SMUs (MP-SMU) and one GNDU. The connections are: emitter → GNDU, ...
- 11
0 votes
4 answers
159 views
Common-positive LED circuit with bipolar logic source
I feel like there's an easy way to solve this, but I don't have the experience to even know what questions to ask or what research pathway to follow. I'm honestly not even sure I'm using the term '...
2 votes
4 answers
498 views
Convert bipolar signal to unipolar without adding a capacitor
Can I convert a +-6V square wave to a 0 to +12 one (at audio rates) without adding a bypass capacitor?A 10uF capacitor kind of messes (skews) the waveform at low Hz rates so ideally I would like to ...
- 73
0 votes
0 answers
68 views
Problem with measuring the saturation voltage of a bipolar transistor using a four-wire connection
I am trying to measure the saturation voltage of a bipolar transistor (SS8050), using a Keithley source-meter, the measurement does not measure the voltage between base and emitter correctly, with a ...
- 21
2 votes
0 answers
211 views
A new model for the bipolar transistor (BJT)
A new model for the bipolar transistor (BJT) is described below (npn only). Unlike the previous classical models based on parts resp.components, this model contains only function blocks and should, ...
- 29.7k
0 votes
2 answers
126 views
How to positive offset a bipolar signal
When working with a LM324N opamp, what is the proper way to configure it to accept a bipolar signal, and output it with a positive offset so that it can be inputted into a unipolar ADC? From my ...
1 vote
2 answers
249 views
Differences in Early Voltage \$V_A\$ in \$V_{CE}\$ vs. \$I_C\$ Graphs for Constant \$I_B\$ and Constant \$V_{BE}\$
I’m analyzing BJT transistor data and trying to calculate the Early voltage \$V_A\$ using two methods: Plotting \$I_C\$ vs. \$V_{CE}\$ with \$I_B\$ held constant. Plotting \$I_C\$ vs. \$V_{CE}\$ with ...
- 79
-1 votes
1 answer
111 views
Ethernet ESD protection between connector and magnetic transformer, bidirectional or unidirectional?
When ESD protection is done between connector and magnetic transformer, I think the bidirectional diode is best suited since the signals are bipolar. Why unidirectional diodes are applied in reference ...
- 67
0 votes
0 answers
66 views
Calculation of amplifying stages on bipolar transistors
please help me. i don`t understand how to do it To develop a circuit diagram of an AC amplifier on a bipolar transistor and calculate the values of the nominal elements of the developed transistor ...
2 votes
1 answer
1k views
This is exactly the wrong way to connect this DC circuit breaker, is it not?
This is another little spin-off question of the main one: DC breakers does polarity really matter? where I want to avoid that it gets flagged as a question that's moving target. One answer that has ...
- 1,721
0 votes
0 answers
54 views
Adjusting the negative output voltage of a bipolar step-down converter in Proteus
I'm working on designing a bipolar step-down DC-DC converter with a +12V input, targeting ±5V outputs. I'm using flying capacitors for the configuration, and I'm modeling the circuit in Proteus 8.17 ...
- 9
2 votes
2 answers
181 views
Why do we use CE mode instead of CC mode?
In bipolar junction transistor, the current gain is maximum in common collector configuration but still we use the common emitter configuration (at least it is the thing that was taught to me). What's ...
- 197
1 vote
0 answers
89 views
Low-noise bipolar boost power supply
I am working on a new design, and have a clarifying question. The circuit is powered from a 5V USB-C connector, and contains a 16-bit DAC (DAC80508) outputting 0-5V, fed into an op-amp circuit to ...
- 101
3 votes
3 answers
445 views
Bipolar analog latch circuit needed
I am struggling with the required circuit design which should latch its output if the signal (from range ±10 V DC) reaches ±1 V (or a certain predefined threshold). I have found on this site a circuit ...
2 votes
1 answer
111 views
How does the capacitance of non‐polarized or bipolar electrolytic capacitors depend on DC bias voltage?
If two identical electrolytic capacitors are connected in reverse series, then at sufficiently low voltage, they should effectively behave as two simple capacitors, which leads to a reduction in ...
- 175