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Recent content by edaenrico

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    Question: What's the best TCXO on the market at 40 MHz?

    Hi, I'm selecting a TCXO for my low power radios. Specs: Frequency: 40 MHz or 38.4 MHz Voltage: 2.8 or 3.3 Volt Ouput: Clipped sine wave Tolerance: +/- 1 ppm Enable pin: optional Package: SMD Any ideas? Thanks, Enrico Migliore
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    H.264 encoder chip: which one?

    Hi, I'm looking for an H.264 hardware encoder chip. Specs: 1. One input channel 2. No external DDR memory Any ideas? Thanks, Enrico Migliore
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    Furukawa TEX-E wire: Where to buy on-line?

    Hi, where can I buy Furukawa's TEX-E wire on-line? I need a few meters of wire because I have to build some transformer prototypes. Best Regards, Enrico Migliore
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    Voltage controlled regulator

    Hi, I have to design a voltage regulator where the output voltage is controlled by an external analog voltage. The output voltage of the regulator range: 0-12 Volt The control voltage range: 0-3.3 Volt I tried with an LM317 without success Thanks, Enrico Migliore
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    What is the white paste inside flyback power supply?

    Hi, thank you for your answer. The paste I have is white and not silver. Take a look here: https://itresident.com/wp-content/uploads/2012/06/IMG_9381.jpg Ciao, Enrico Migliore
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    What is the white paste inside flyback power supply?

    Hi, I'm repairing a power supply unit. I removed the plastic case and then I found a copper shield which is in close contact with the transformer. Between the transformer and the copper shield there is a "white paste"? What is that? Thanks, Enrico Migliore
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    Question: UL E file number assigned to PCB traders

    Hi, I assure you that the company is a PCB provider (trader). I'll contact my UL safety engineer and I'll let you know the answer. Enrico Migliore
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    Question: UL E file number assigned to PCB traders

    Hi Klaus, check this file number: E313544 it belongs to an Italian PCB provider. I met those guys and they told me that they are trader. They made agreements to some Chinese PCB manufacturers. Enrico Migliore - - - Updated - - - Hi Klaus, in the past, I also found that 3 Chinese PCB...
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    Question: UL E file number assigned to PCB traders

    Hi, I believed that the E file number was assigned by UL to PCB manufacturers only. I noticed instead that some PCB traders have the UL E file number. Question: How is that possible? Thanks, Enrico Migliore
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    Question: 6-layer pcb manufacturing steps

    Hi, I have a PCB which is made of: 1 core and 2 pre-pregs. Does anybody know the steps for manufacturing this 6-layer PCB? Thanks, Enrico Migliore
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    Flyback efficiency calculation: RMS or AVERAGE power?

    Hi, I'm a bit confused. I'm measuring the efficiency of my off-line 230 V flyback converter. I sampled the mains voltage Vin which is a sinus wave. I sampled the Input current flowing from the mains into the converter which is a non linear curve. To evaluate the efficiency I need to...
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    Question: Does a master part number file, containing all parts, exist?

    Hi, I'm looking for a file that contains all the MANUFACTURER PART NUMBERS of all parts. Example: ... ST,L7805CV ST,L7805CT ... TI,TLV1117LV, ... Thanks in advance, Enrico Migliore
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    Question on: NXP's new QR Power Supply - 65 W - 94% efficiency

    Hi, I purchased the following EVAL BOARD made by NXP: https://www.nxp.com/demoboard/TEA1836DB1094.html The controller TEA18361 is QR. QUESTION ------------ The PCB is a 2 layer board. Even though the PCB has 2 layers there are no tracks on the TOP layer. There are just 2 jumpers. Can...
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    40 W FLYBACK TRANSFORMER - Which core is best to keep low the leakage inductance?

    Hi, the leakage inductance depends on how well you build the transformer. That page helps you choose the right core. Enrico Migliore
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    40 W FLYBACK TRANSFORMER - Which core is best to keep low the leakage inductance?

    Hi, are you sure about low leakage inductance of core PQ2620? Take a look at this Fairchild's Reference Design: https://www.fairchildsemi.com/support/referencedesign/docs/RD-342.pdf The leakage inductance is 20 uH and the primary is 600 uH That means 3% of the primary which is very bad...
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