How to Design a Circuit with Diodes and Resistors for Specific Voltage Outputs?

[fbenit1]

It says using diodes, resistors, and zener diodes only, design a circuit whose output remains zero for vin<3.6V, but equals vin minus a drop of 3.6V for vin>3.6V. and the circuit has to work when the input voltages are below 0 as well as above 0. and help is appreciated.

 

[Wetmelon]

Ok. So what have you got so far? That's the problem you were given, but we're not going to do your homework FOR you. What specific question do you have?

 

[fbenit1]

I have just been thinking what i can do, I have thought that maybe having Vin and next to Vin connecting a pn junction diode so that any point before the turn on voltage, Vout would equal 0. (trying to get the idea from the half wave rectifier.)

but don't know how to get the 3.6 value as my point of change. I don't know if i am going in the right direction

 

[schlunk]

From what you are writing, it sounds like you need to read some more about zeners.

 

[DeeNos]

This is a good question that involves designing a circuit using basic electronic components such as diodes, resistors, and zener diodes. The goal of the circuit is to have an output of zero when the input voltage is below 3.6V, and to have an output equal to the input voltage minus 3.6V when the input voltage is above 3.6V. Additionally, the circuit must work for input voltages both above and below 0V.

To design this circuit, we can use a combination of diodes and resistors to create a voltage divider. This voltage divider will be used to limit the input voltage to 3.6V when it is above 3.6V, and to pass the input voltage as is when it is below 3.6V. The zener diode will be used to create a fixed voltage drop of 3.6V.

First, we will place a zener diode in parallel with a resistor between the input voltage and ground. This will create a fixed voltage drop of 3.6V across the zener diode. Next, we will place a diode in series with a resistor between the input voltage and the output. This diode will act as a switch, allowing the input voltage to pass through when it is below 3.6V, but blocking it when it is above 3.6V. The resistor in series with the diode will limit the current flow.

To ensure that the circuit works for input voltages both above and below 0V, we can place another zener diode in parallel with the first one, but in the opposite direction. This will allow the circuit to work for negative input voltages as well.

In summary, the circuit will have a zener diode and resistor in parallel, followed by a diode and resistor in series. This combination will create the desired output of 0V for input voltages below 3.6V and an output of the input voltage minus 3.6V for input voltages above 3.6V. The additional zener diode in the opposite direction will ensure that the circuit works for negative input voltages as well.

I hope this explanation helps in designing the desired circuit. It is always important to carefully select the components and their values to ensure the circuit functions as intended. If you need further assistance, do not hesitate to reach out for help.