# Tag Info

1 vote

### Transistor AND gate problem

What you created is an NAND with an open collector output. The Output would be at the collector of the upper transistor and the LED will light up when the output is low. simulate this circuit – ...
• 3,334

### How do I analyze an emitter follower with a capacitive load?

how can I predict the emitter voltage or current? Generally, you'd do it by solving the differential equation system that models the circuit. SPICE does it numerically. You may be able to come up ...

### Power dissipation in an IC

Made with microcap v12. For this task, you could use the file "uA741.cir" included with microcap. Microcap calculates the full powers by "definition". Here, it should be 72 mW ...
• 14.3k
1 vote

### Power dissipation in an IC

What is the correct method to calculate power dissipation in the circuit which means power dissipated in all BJTs? Assume no load is connected and no input signal is applied to either inputs, and ...
• 35.6k
Accepted

### Power dissipation in an IC

Think of the opamp as load like a simple resistor. The power dissipation of any load is defined by the voltage over the load and current through it. With +/- 15V supplies there is 30V over the load so ...
• 158k
Accepted

### How do I analyze an emitter follower with a capacitive load?

Since the transistor is only able to source current from the positive supply, implying current flowing downwards through the capacitor, and since you've provided no way for current to flow upwards ...
• 38.3k
1 vote

### Simple BJT circuit problem

The schematic does not explicitly specify the potential of the lower node, and you are correct to question this. You are also probably correct that the author intended this to be 0V. For the PNP ...
• 38.3k

### Why is a push-pull transistor configuration asymmetric?

Each transistor is responsible for passing current in two different parts of the input/output waveform, between which current in the load changes direction. The upper transistor is allowing current to ...
• 38.3k

### Why is a push-pull transistor configuration asymmetric?

Everyone has already pointed out that one of your transistors is arranged incorrectly. So I won't belabor it here. Sufficient that you know it won't work. The phrase ...
• 11k

### Why is a push-pull transistor configuration asymmetric?

Your circuit is invalid. Try something like this. It can operate from a single-ended power supply. Reference the amp to 6-volts. Circuit reference https://circuitdigest.com/electronic-circuits/push-...
• 643

### Why is a push-pull transistor configuration asymmetric?

But that's not a valid push-pull circuit to begin with. You have the PNP transistor upside down. Even if it were correct, for negative output you would need a negative supply and you don't have one. ...
• 158k

### Simple BJT circuit problem

Is the problem missing some vital information? Yes, very much, as you note yourself. It is missing: Ground connection. This is reasonably assumed to be the horizontal at the bottom. Transistor ...
• 23.4k

### Simple BJT circuit problem

The inclusion of the switch also seems weird to me, as its purpose isn't relevant to this practice problem. Re-reading the problem statement: The 5Ω heater in Fig. P-1.6 is to be turned on by closing ...

### How do I analyze an emitter follower with a capacitive load?

The problem is that you're trying to linearize about a DC bias where the transistor is deep into cutoff, because there's no way for C2 to discharge. The emitter voltage is pinned to Vcc, and you're ...
• 35.1k
Accepted

### Simple BJT circuit problem

The ground is the line at the bottom common to the switch and heater resistance, they just didn't mark it as such. The switch is relevant, it is the thermostat switch as mentioned in the problem. It ...
• 24.7k

### Identify board components Yaskawa Z1000 VFD

The component on top is a 10 kΩ resistor. The one on the bottom is a SMBJ17CA TVS diode made by Diodes Inc. (Source: lcsc.com)
• 5,837
Accepted

Most probably it is a single 2-input AND gate, SN74LVC1G08DCK in SC70 packaging.
• 1,148
Accepted

### Can anone identify this IC marked 55JT?

It's a Texas Instruments LM95245 temperature sensor. (Source: aliexpress.com)
• 5,837
Accepted

### Identify IC marking LCSZ

It's an Analog Devices LTC3563EDC step-down converter. (Source: lcsc.com)
• 5,837
1 vote

### SMD transistor identification

Likely, Transistor is C1815. you can search c1815 smd in google.
• 21
Accepted

### Why do I have to increase the current by 2V when I am using a transistor?

It is dim because the collector-emitter saturation voltage for your transistor is ~2V. Use a logic level MOSFET and a current limiting resistor. You won't be able to get full brightness with a 3V ...
• 20.2k

### Can anybody help me identify this SMD component?

Looks like pmv65xv in 12/24 power supply. I have the same problem in TLC and i have the blue print of the circuit
Accepted

• 406k