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Did anyone found a solution? I also have a problem using the ST7540's SPI interface. I use RXTX as ENABLE line (that is the only explanation i can find from reading the datasheet) but the clock plays its own game. There is no sequence. Here is a screenshot of the SPI while changing RXTX line...
I think that the box is the last think you have to be worried about. First you have to design the circuit on paper, test in on a prototype and then design it to feet on a box of your choice.
Hello i am on the way to design a new power supply for my bench. The outputs i want to be some fixed voltages like: +3.3V, +5V, -5V, +12v, -12v about 2A (for supplying digital chips /operational amplifiers etc) and one or two adjustable outputs 0-30Volt 0-3A (for testing circuits). By this...
I have tried it with two different power supplies one from PC and a homemade PSU. Both have the same result. I also have replaced the diode with the MBR1100.
Well i had posted the same problem to avrfreaks forum and the guys from there mentioned me that at the datasheet example scheme there is an input 100uF capacitor that i didn't include in my design (i didn't thought that it is necessary as my voltage supply comes from a stable PSU). I gave it a...
My load requirements is about 600mA to 650mA. I have also tried with 0.4ohm(2x0R2 in series) but the result is the same. In the design of the Jenny IV-12 clock that i posted above he has used a pcb shunt instead of 0.2 Ohm resistor.
Yes the timebase is 5us/div. The inductors are 2x22uH/1A connected in series. The voltage across the current resistor (0R2) is 11.13V at one end and 11.10 to the other. So the difference voltage is 0.02V thus I=0.1A if you mean this.
I have tried with two different capacitors as i said above. 166pf and 330pf. 166pf make it work at 120 to 160khz and the 330pf makes it work at about 40khz. In both cases the chip is heating up
Ok. i'm gonna give a try with the MBR1100 that i have for now. It is an 1A SCHOTTKY RECTIFIER
---------- Post added at 17:20 ---------- Previous post was at 16:01 ----------
I tried the MBR1100 but the result is the same... The chip is still getting hot
The output voltage now is 2.4Volt and the load is 10 Ohm resistor which is about 200mA of load. The small glass diode in the photo is a 1n4148 diode which is connected in series with the inductor as shown in the schematic but it is a 1n4148 than 1N5908.
When i talk about current i talk about the current that draws the MC34063 from the 12VDC Supply Voltage so the input current of the chip. When i took those waveforms the supply voltage was 11.4 measured by the oscilloscope.
I took some temperature measurements. Here you are:
time/temp...
I tried with two different Co 166pf (100pf+33pf+33pf in parallel) and 330pf. With 166pf the SE frequency (pwm) is about 120 to 160Khz and with 330pf is about 40 to 50Khz. In both cases the MC chip overheats. At 120khz (166pf) the input current starts from 90mA and at 40khz (330pf) the input...
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