Ps. Ripple measured with a Tektronix oscilloscope, maybe it is also possible to measure it with a multimeter set to AC Volts. There are many applications associated with MC34063, a few of them are Human Machine Interface (HMI), Portable devise, Measurement and test, Gas and blood analyzer, computing, Telecommunications, Cable solutions, etc. 1N5819 The data sheet for this converter says that the turn-on time, rise time, and delay time are all in the sub 40ns range--so it should work fine, right? All the circuits have different performance. The voltage divider circuit is not recommended for use in the high current application as it has a low output current and lower efficiency. LM7805 12v to 5v converter: Have you thought of making a shield to level shift between a 3.3V Arduino/shield and a 5V shield or the other way around. Then one simply uses the shield to make other shields compatible with shields of another voltage.

Pin number 1 is the source supply terminal. Pin number 2 is the ground terminal. Pin number 3 is the output voltage terminal. I calculated the efficiency of each module per each type of load as: eff = Pin/Pout = (Vin*Iin)/(Vout*Iout) The LM317 is an adjustable voltage regulator IC capable of supplying more than 1.0 Ampere of current with a wide range of o/p voltage from 1.25 Volts to 37 Volts. Its regulation is a little bit better than other fixed voltage-regulator IC like LM7805, 7806, 7808, 7810 … The 1st UUT had too high voltage, which is most likely because it was supposed wi work with much highter loads. Thus, it’s not good of driving mAmps loads, but would probably be OK with 1-2 Amps. Anybody know the actual pad dimensions for us non-Eagle users? I don't have it yet but want to begin laying out a board, and I would rather not guess. Thanks.

Candidate modules

Perhaps the most important element in your decision process is who made the converter and who is supplying it. In a perfect world, you will have heard of both the supplier and the manufacturer. You may even have personal experience with both of them. This will give you the confidence to buy their products.

Peak current refers to ability to provide high current for a limited length of time. Max current refers to maximum current the module can provide consistently. Mind that some modules mention that operating at max current might require an additional heat-sink or cooling solution. I am trying to use this with my electric imp as an I2C level shifter for my sensor which requires 5V input. At 5V with an arduino, it needed a pull up resistor of 4.7K. But I haven't been able to make it work with the electric imp. What do you propose me to do about the pull up resistor while connecting with the electric imp! I got this to connect my Edison (1.8V I/O) to a Sparkfun LSM9DS0 breakout (3.3V I/O) using i2c. It's working perfectly, so far. What is the ground pin used for? In the schematic it appears to be not connected but not connecting them in my current setup gives strange results.Next I measured the current used by the converter on the input side, for both a device load and a dummy load. I observed that a real load and a dummy load with same average current both have a similar efficiency. A difference could arise since the dummy load power draw is fixed while the device could draw power in bursts, but this didn’t affect the results significantly. I concluded that using dummy resistors is good enough approximation for this test. What is the cut-on voltage for the BOB on the HV side if HV is set to 5v? I ask because sometimes the device I'm connecting to the HV side has 5v signals, and sometimes it has 3.3v signals (with HV set to 5v in both cases). It seems to work, but I wonder if I'm on the hairy edge. If cut-on is 2-2.5v then I think I'm ok, if it's around 3v then it might miss sometimes. Any chance of getting this part into the Fritzing parts list for sparkfun? The unidirectional level converter is in there but the pins do not match.

Generally, LM317 is a variable power supply IC that can provide a variable but regulated output voltage from 1.25 Volts to 37 volts depending on “Vref” (reference voltage), the voltage on pin number 1 (Adj.) which is reference voltage taken from a potentiometer. Adj. is voltage for adjustment. Below is a voltage divider circuit build using LM317 gives a fixed voltage of 5V at pin number 2. There are many different reasons why you may need a 12V to 5V converter. If you are looking to reduce the supply and create a USB port then the Uctronics converter module could be the perfect solution for you.I’m using ‘Fine’ for a hobby solar-project, charging my phones etc. What I can’t figure out with my ‘Fine’ is this: My input is 6.5 V/350 mA, this will result in 4.85 V/240 mA after ‘Fine’ is done and having a charging phone connected, so it should draw some juice.. Now, maybe I’m just overseeing some basic physics here.. Do you think I do have a faulty ‘Fine’? Most of my Arduino type boards are 5V although many do have 3.3V available. Nevertheless, with this converter it is easy to wire up 3.3V devices to 5V. Awesome. finally you guys made a quad bidirectional version of the logic converter circuit (it was quite requested i do believe). What makes “Fine” better than others? It is a relatively new IC. The datasheet is from 2014 where, for comparison, the MP2307’s is from 2008. It also features a very low Rds(on) values (90mΩ/40mΩ), but most interestingly the MP2315 has AAM (Advanced Asynchronous Modulation) power-save mode for light load. I made an account just to ask this question, as it has been driving me crazy. For some reason, when I have 3.3V on the LV and 5V (actually around 5.5V) on the HV, the signals coming out of the HV end are all around 2.6V. Does anyone have some suggestions to fix this?