Tagged Questions

2
votes
1answer
157 views

Opamp topology without a stable voltage reference

I have an opamp configured as a constant current sink like this: As you can see, the reference voltage for the SENSE pin is set by the voltage divider on the left. This requires a stable voltage on ...
1
vote
1answer
304 views

how to reduce 24v to 0- 2.5v through a pot

I have a 24v dc supply and I need to give a heater a 0-2.5v variable input. I have a very limited understanding on electronics but I've read here about voltage dividers. I used a 10k pot (and the 2 ...
6
votes
2answers
128 views

Setting a part's VCC slightly lower than board's supply voltage

I'm interested in using the undervoltage detection feature (in addition to the primary function) of this chip. This IC draws 6 uA (microamps), and accepts any VCC between 1.6V and 5.5V. The ...
3
votes
2answers
2k views

Is this 7805-based design correct?

I found this design on internet: It is said to be a regulated power supply with variable DC output 5-15 V, 400 mA. My first question: Is this design around 7805 correct? I am asking because it ...