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  1. Miguel Lopez

    VHF booster

    I'm agree with you that this is a dinosaur, but it is what I have. I've got some characteristic of this transistor that I can post here, basically maximun ratings. Would that be useful? And what about the circuit configuration? PS: This type was massively used on Soviet precision laboratory...
  2. Miguel Lopez

    VHF booster

    Ok, and what's the solution? Any suggestion? And, what's the problem with Germanium?
  3. Miguel Lopez

    VHF booster

    Transistor is 1T311 Germanium NPN (Soviet)
  4. Miguel Lopez

    VHF booster

    Please, keep focussed. This is about a VHF booster, not about Cuba-US relationship. Open a thread in the Off-Topic Members Lounge section to talk about that I will post the schematic today. PS: Old cars (1940s - 1950s) in Cuba are as common as air.
  5. Miguel Lopez

    VHF booster

    Oh, really!!?? I challenge you to find any in a Cuban shop.
  6. 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...
  7. Miguel Lopez

    amplifier

    Up to 500kHz? Living cells? What kind of cells are you going to stimulate. Sorry, for the question, I work on a biopharmaceutical factory and I'm curious.
  8. Miguel Lopez

    Building a digital clock

    I have build two digital clocks in the past using Soviet and Czeck TTL chips. Have you thought to use this type of devices, or CMOS equivalents?
  9. Miguel Lopez

    Running an LED off a 120v wall outlet

    I'm agree with Iron Will. A 9V battery could power the LED for several months, maybe a year.
  10. Miguel Lopez

    Amplitude Modulation using Op Amp.

    Sorry but all schems found in that search use FET's or the CA3080, which is to available to me. Thanks anyway.
  11. Miguel Lopez

    Amplitude Modulation using Op Amp.

    Thanks Bob Google and you are both good friends :D
  12. 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...
  13. 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
  14. Miguel Lopez

    Self-oscillating circuit for 5V power supply

    Thank you Steve. I had already visited that site. In fact I have all of that diagrams in my PC. I also reversed engineered one of the CFL we have in Cuba. My first idea was to rewind the transformer in the CFL but they work with the load connected. I don't know how to replace the load...
  15. Miguel Lopez

    Self-oscillating circuit for 5V power supply

    Any diagram?
  16. Miguel Lopez

    Self-oscillating circuit for 5V power supply

    Sorry, I can not. I did it once. The transformer was not suitable (too small) and it got hot a lot. Despite that, it worked well, more or less. But there isn't another transformer available at suitable size. Too big or too small. I'm trying to find a suitable solution, technically and...
  17. 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...
  18. Miguel Lopez

    Greetings from Havana

    I will rob some of my uncle's. I'll tell you later :D :D :D Amazing!!!! :D :D :D
  19. Miguel Lopez

    Greetings from Havana

    Thanks to all of you for your welcome. Well, I found this forum looking in the web for a constant output amplier in the AF band. I've seen some threads of interest and I'm reading them. Maybe I find something to solve my problem. Very difficult indeed. Almost every single component I get...
  20. 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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