# Tagged Questions

194 views

### What's the relationship between volts and amperes in batteries?

I recently bought a bag of 100 5mw 4.5V laser diodes (the spec said they have "driver: out"). My idea was to connect two and two of these in series to get something that needs 9V, and then connect ...
250 views

### Vin output voltage of an Arduino

I have got a very simple and fast question. I have connected 6v to the power jack of my arduino, and when I tested the output voltage from the Vin, it turns to be 5.3v with no connection and 4.8 with ...
2k views

### How to calculate a current being drawn by a full wave rectifier diode bridge?

I've been studying power supplies and diodes, all books I've read discuss a great deal of things, but there's something I haven't found, and that is how to calculate how much current a bridge ...
165 views

### How to protect an electronic construction kit (a toy) from damages?

As I child, I had this electronic construction kit called Elektronik 1. It was manufectured in former Czechoslovakia, based on resistors, diodes, bjt transistors, capacitors, an LW+SW radio antenna ...
211 views

### Current flow priorities in PSU / PSU review

Being an electronics hobbyist, I'm having quite a challenge to design a PSU, which must run both on batteries (during the night time) as well as on Solar energy (daytime). The device is intend to run ...
1k views

### Diode between VCC and GND

I was having a look at some guitar effect circuits and came across with a company that offers PCBs for some well known circuits. I have noticed that most of ther circuits have a 1N4001 (D1) placed ...
2k views

### Current limiters using transistors and diodes

I have been experimenting with simulating current limiting circuits. I am trying to limit current to ~500mA given a fixed 4.8V source. I started a question based on a conventional 2-transistor current ...
397 views

### What efficient techniques exist for rectifying high voltage?

I want to rectify 120V (mains North America) at a relatively high amount of current (5 amps), so naturally my first idea is to just find a bridge rectifier. After finding one capable of the current ...
115 views

### Device is reset when switching power sources

I use a home weather station. It is powered by two AA batteries (2 x 1.5 = 3.0 V nominal). The problem is that it eats more than 1 mA and that is quite a lot of power and I must buy a new pair of AA ...
4k views

### Is full wave rectifier better than half wave one?

I am curious if there are practical differences between a DC power supply based on a half wave rectifier or a full wave rectifier. I mean I have a few small DC power supply units which should give ...
260 views

### Diode substitution in power supply

Can I substitute 3A diodes in a plug in power supply for 2A 50V diode? Should I replace all 4 in the bridge? It's a 15VDC 1300mA power supply.
1k views

### Simple $12V_{AC}$ to $12V_{DC}$ Rectifier

I want to convert a $12V_{AC}$ power supply output to use $12V_{DC}$ to power some outdoor LEDs. The power supply as it stands will light the LEDs (with a slight flicker from the reverse ...