Search found 6 matches

by RachelAnne2020
30 Nov 2021, 23:35
Forum: Hobby Circuits and Small Projects
Topic: Design an isolated power supply
Replies: 0
Views: 169

Design an isolated power supply

I want to design an isolated power supply with DC24V input and DC5V output. What IC is better to use as a switch tube? Ordinary power supply ICs are switching power supply ICs with DC100V~DC350V rectified from AV80~AV250, which may not work in the range of DC18V~DC30V. So I would like to ask what po...
by RachelAnne2020
22 Nov 2021, 03:54
Forum: Off-topic
Topic: What sensors are used?
Replies: 0
Views: 285

What sensors are used?

If a car wants to realize unmanned driving, what electronic control systems need to be equipped? Give examples of the sensors used?
In addition to the examples in this article: https://www.utmel.com/blog/categories/s ... ing-sensor
by RachelAnne2020
03 Nov 2021, 05:34
Forum: Other questions and issues
Topic: What to do if the voltage is pulled down?
Replies: 0
Views: 129

What to do if the voltage is pulled down?

Using uc3843 for boosting, the voltage can reach 36V when there is no load, but after adding a 50-ohm high-power resistor, the voltage is pulled to 27V. How to solve this problem
Introduction of UC3843: https://www.utmel.com/components/uc3843 ... ses?id=388
by RachelAnne2020
14 Sep 2021, 23:13
Forum: Off-topic
Topic: Signal input problem
Replies: 0
Views: 2216

Signal input problem

Regarding the signal input of mt8870, there are two telephone lines, but there is only one signal input end of the chip. How to connect? As shown in the figure, there is only one input terminal but two phone lines. How do I connect and how to take out the DTMF signal from the phone line? If I use a ...
by RachelAnne2020
08 Sep 2021, 23:30
Forum: Other questions and issues
Topic: What is the on-resistance?
Replies: 0
Views: 1896

What is the on-resistance?

CD4066 VDD 5v, VSS is grounded, the control voltage is input 2v, what is the on-resistance? I measured more than 7k, but the data is about 270~1000. When the control voltage is increased to 5v, the on-resistance is about 444. I want the single-chip microcomputer to directly control, that is, I want ...
by RachelAnne2020
24 Aug 2021, 03:54
Forum: Shared Projects and Ideas
Topic: Used MC34063A to make a charger for lithium iron phosphate battery
Replies: 0
Views: 2052

Used MC34063A to make a charger for lithium iron phosphate battery

For the sake of simplicity, I didn’t use a special cross-current circuit. I directly use Rsc to limit the maximum input current Ipk. My Rsc uses a 2W metal film resistor that is about 0.5 ohms. It is about 600mA charging current under 9V input. Too big, next time I have the opportunity to change it ...