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Recent content by Garyl

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    Initializing ad7302 with pic18f97j60 (in MikroC)

    you don't have any "wait" instruction in your loop while(1) { PORTG.RG3=1; PORTG.RG4=0; PORTG.RG0=0; // PORTF=UART1_Read(); PORTF=0xff; PORTG.RG0=1...
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    ferrite bead resistance/inductance/part id for ethernet?

    Hey, does a "FERRITE BEAD" part has a specific resistance/inductance value in the ethernet application? I am making a circuit similiar to the one from attachment: On the page 9, there is L2 "Ferrite Bead" between VDD (3.3V) and Ethernet magjack circuitry. I am looking for more information...
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    Planning to purchase PIC development board

    Do you want to use 8bit pic, 16 bit or 32? I'd suggest you doing this project: https://chipkit.net/diy-chipkit-board/ great for start, entirely THT and breadboard friendly, USB interface, Arduino-like IDE programming with bootloader or just like any other pic with pickit3
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    Connecting another audio amplifier to existing circuit

    Hey, I have an old, broken cd/tape/radio player with fried final amplifier stage. Previous owner said that he had accidentally shorted the loudspeakers wires and that fried the audio output. I've found schematic and the related part of the circuit: I want to attach another amplifier because...
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    AD 9833 strange sine behaviour or is it the scope?

    The return paths of digital SPI control, or the analogue signal output? I can show the PCB if it helps. I have also searched the web more and found out that AD 9833 for some reasons is not used at higher frequencies. For example here...
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    Better and worse LM386M amplifiers

    I've been soldering two copies of the same circuit with brand new LM386M and I realized that first one has literally zero noise (unless I touch the potentiometer pins), and second one has a constant, loud noise (but still reacts to touching pins). I've been testing both circuits with the same...
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    AD 9833 strange sine behaviour or is it the scope?

    10x probe and better ground probe connection is not changing much. The square wave output is more looking like a sine at 5MHz or so... The chip is on bottom side of twosided board, the top side is entirely GND, there is also ground around it and ground vias connecting top and bottom ground...
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    AD 9833 strange sine behaviour or is it the scope?

    Probe is 1X, ground connected to 7805 case... You are right, but I have already taken it into account. It's very easy to set clock value in this lbirary: //AD9833 gen(FNC_PIN); // Defaults to 25MHz internal reference frequency AD9833 gen(FNC_PIN, 24000000UL); // CHANGED - use 24MHz...
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    AD 9833 strange sine behaviour or is it the scope?

    I don't think that I can use Arduino ADC to check anything at 8MHz. Here is how my connection looks like: basic circuit (Arduino UNO is connected to AD 9833 by SPI): AD 9833 chip board: I've tried to upload the scope movie as gif, but it does not work on the forum, so all I can show is the...
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    AD 9833 strange sine behaviour or is it the scope?

    Hey, I just want to make sure if that's normal.. The AD is driven by Arduino, it's a square/sine signgal generator rated up to 12.5MHz. It's powered by 5V. The used Arduino library is here: https://github.com/Billwilliams1952/AD9833-Library-Arduino The used clock source is 24MHz. The SQUARE...
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    unknown diode HS06 DO23

    hey I have unknown didoes which looks like Zener., around 100 pieces.. It's in the bag with label "HS06DO23", and on the diode has label 4B91 or 914B... Any ideaas what it might be?
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    Help in downloading program from PC to Atmega16

    I might be wrong but I remember that I solved this problem several time by inserting a random 8-20MHz (any of 8MHz, 10MHz, 12MHz, 16MHz, 20MHz or similiar) crystal between the OSC/crystal pins of Atmega. So it does not have to be the exact crystal used for the previous configuration... If...
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    identify zener diode Z82M

    Hey, I've got a zener diode that has text which looks like "Z82M" or maybe "Z82N". I havent managed to find anythinb about it in google. It's a brand new diode, I've got a couple of them from old TV production line. Can anyone help identyfing it? Thanks in advance!
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    Intermediate frequency and input frequency

    Sadly I have already ordered the PCBs according to the schematic from the article, where the +12V line is used. I already have 80m version, but I am going to make 20m and 40m version as well, by using the frequency difference from mixer (14MHz-4MHz=10MHz). Also I am thinking about adding an...
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    Intermediate frequency and input frequency

    Thanks. I must have misunderstand the theory, because I tought that there are TWO TYPES of mixers. I will need to reread that stuff again! There is already a bandpass filter in front of the first mixer... can you explain how the second filter can improve the reception even more? Do you have...

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