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  1. Audioguru

    Hello, can somebody help wich transistor is like bfg520

    You have 0 30Mm 10.7Meg 50 1000 in SFFM: 1) The sim program does not know 30Mm which should be about 500mV. 2) The 50 is the modulation index that should be 2000. You also have an AC command that should be removed because it shows the frequency response of something. The sim program cannot make...
  2. Audioguru

    Hello, can somebody help wich transistor is like bfg520

    Do you know what is a "model" of an LM386? it has all the specifications so the simulation program knows its input pin numbers, how much voltage gain it has and how much output current it has. I think your sim program does not have a model of an LM386. Disconnect C8 from the LM386 and have your...
  3. Audioguru

    Hello, can somebody help wich transistor is like bfg520

    1) You have the audio output of the radio tuner shorted directly to +12V. Then there is no audio and the LM386 will be destroyed. 2) The simulation program needs a model of the LM386 and you must show its pins numbers on the schematic. 3) R4 is not needed but you need a volume control. The...
  4. Audioguru

    Hello, can somebody help wich transistor is like bfg520

    It is extremely easy to see how to fix your mistakes:
  5. Audioguru

    How to choose the correct potentiometer?

    Bourns have a website for their 91 series pots with big long part numbers for the type of shaft, bushing etc. and if it is linear (that you need) or audio (logarithmic).
  6. Audioguru

    LED Strip from coin cells

    Each LED draws about 20mA to be very bright but the fairy lights probably draw 5mA or 10mA so that they are not too bright. You have 40 of them so their total current is about 200mA to 400mA. They are designed for 4.5V from powerful three AA cells. CR2032 cells are small and weak so their 6V...
  7. Audioguru

    Hello, can somebody help wich transistor is like bfg520

    Everybody in this forum knows how except you.
  8. Audioguru

    Hello, can somebody help wich transistor is like bfg520

    You changed the audio frequency to 1MHz which is not audio. Q1 and the LM386 are not powered. There is no volume control. The value of C14 is one million times too small. Try C4 both ways:
  9. Audioguru

    Hello, can somebody help wich transistor is like bfg520

    You did not fix the problems: 1) Q1 is still not powered. 2) V3 is not needed. 3) R10 is not needed in parallel and is not needed in series. 4) C4 is not connected to ground. 5) There are still no pin numbers on the LM386 amplifier. 6) C10 is still blocking the DC power to the LM386 amplifier...
  10. Audioguru

    IR Receiver Problem

    The output of the receiver is pulses that you multimeter cannot properly measure. Since the tx and rx do not work then are they a cheap Chinese product from ebay?
  11. Audioguru

    Hello, can somebody help wich transistor is like bfg520

    More mistakes: 1) Q1 is not powered since L1 shorts the DC from R5 to ground. R5 and maybe L1 will burn up. 2) V3 is not needed. 3) Why do you have R10? It is shorting most mid and low audio frequencies to ground because it is calculated wrongly and it is not needed. 4) C4 is not connected...
  12. Audioguru

    Hello, can somebody help wich transistor is like bfg520

    You added the LM386 to an old radio schematic that was full of errors. The new schematic still has most of the old errors. On the radio, Q1 is not powered by anything and is not connected to L1.
  13. Audioguru

    Hello, can somebody help wich transistor is like bfg520

    1) V3 is 0.5 "somethings" again then the transistors have no power supply and they will do nothing. 2) The base of Q1 is shorted to +12V again. 3) The coils on the transformers are missing the polarity dots again. 4) C4 is not connected to ground again. 5) The radio is not connected to the LM386...
  14. Audioguru

    LED Strip from coin cells

    The fairy lights have all the LEDs in parallel. They are normally powered by 3 AA battery cells and the ad says 4.5V so they must have a resistor in there to limit the current. The two CR2032 cells have much less capacity than the AA cells so their overload will drop the voltage so the LEDs...
  15. Audioguru

    Hello, can somebody help wich transistor is like bfg520

    Which battery is 2V? V3? It is shorted to ground on your mess of a schematic. I asked you to post how you connected the output of the discriminator to the LM386 amplifier and show all the details of your LM386 amplifier but you do not show them.
  16. Audioguru

    Hello, can somebody help wich transistor is like bfg520

    Yes, you make the same errors over and over and over and over and ….. I like your huge 0.01 Farads capacitors. They will kill all output sounds. Why are the transistors powered from only 0.5 somethings?
  17. Audioguru

    IR Receiver Problem

    As I said, the datasheet shows that the durations of bursts and pauses between bursts of output pulses must be as listed on the datasheet. Maybe your remote makes different bursts and pauses durations then the IR detector ignores them. If your remote produces continuous IR or a frequency that is...
  18. Audioguru

    LED Strip from coin cells

    You said you have LED strips which are usually 12V. 20 LEDs on twin wire are not an LED strip and probably have them in parallel. They are probably powered from your two weak overloaded battery cells. Please post a link to the LED product or see if there is a resistor or something that limits...
  19. Audioguru

    IR Receiver Problem

    The TSOP IR receivers do nothing if the IR is not modulated at their set frequency (yours is 38kHz) and with certain burst durations (yours is 40 cycles of 38KHz to 75 cycles of 38kHz and similar pause times between bursts). If your burst lengths are longer then nothing happens to avoid...
  20. Audioguru

    LED Strip from coin cells

    Most LED strips are 12V, not 6V. They have 3 LEDs in series with a resistor and if each LED is 3.5V (blue, bright green and white) then they do not light with less than 10.5V. Some red LEDs are 1.8V and a strip will light with 6V.
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