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  1. Miguel Lopez

    Problem with P2015 HP printer.

    Hello I have a P2015 Hewlett-Packard printer at the office that is presenting a problem. When it takes the paper from the bottom tray, it prints the page you ordered, and then it takes another sheet of paper and pass it throught the printer leaving it blank. It does that with every single...
  2. Miguel Lopez

    CP2124P - U0707E

    Hello everyone I'm looking for the datasheet of an IC with the markings CP2124P and U0707E. Don't know which of them is the IC type. I have not found them in "alldatasheet.com" using both markings. It might be something similar to LM324 or LM339, cause it is the IC present in a fridge...
  3. Miguel Lopez

    Cuban Cuchufleta

    In another thread, we were talking about the possibility to obtain energy from a water hose. As that thread was closed, and I didn't know where exactly to open this one, I open it here. If this is the wrong place, I beg the Mods to move it to the right place. The term "cuchufleta" is the name...
  4. Miguel Lopez

    VHF booster

    Hi all I need to build a TV booster for the VHF range (channels 2 to 12). I thought on a self-biased stage with a capacitor across the emitter resistor, using a Soviet 1T311 NPN transistor (Ge), because it is the only HF transistor that I have. My cuestion is about the configuration of the...
  5. Miguel Lopez

    Amplitude Modulation using Op Amp.

    Hello. I've trying to make an amplitude modulator using Op Amps, both I didn't get it. I'm asking for help on an schematic to do this. I used the adder configuration with op amp and even when the carrier contained the modulator signal, it is not exactly what I'm looking for: a true...
  6. Miguel Lopez

    Schematic for NL560 lantern

    Hello everybody I've been working on a Sanyo NL560 lantern. It had one transistor blown up. I fixed it already replacing the transistor by a Soviet one, but I'm interested to have the schematic because I always like to go to the bottom :D. Any help welcome. Thanks
  7. Miguel Lopez

    Self-oscillating circuit for 5V power supply

    Hello everybody. I'm trying to make the circuit shown bellow using the components of a CFL (HV transistors, ferrite core, HV diodes, HV capacitors, etc) in order to obtain a 5V source to supply a TTL-made timer which demands up to 500mA I need some help with the cicuit configuration (for...
  8. Miguel Lopez

    Greetings from Havana

    Hello everyone. My name is Miguel, I live in Cuba and I love the world of electronics. I hope I can learn and help about this subject in this Forum. Being myself a Spanish speaker, I apologise on my future spelling or grammar errors. I'll be reading the forum in order to look for some...
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