Характеристическая кривая S-типа. Приемник по сути представляет собой детекторный приемник с регенерацией. Регенерация регулируется напряжением питания (током, протекающим через транзистор). И наоборот, включений транзистор имеет падающую характеристику мА/В с переменной крутизной (переменное негативная дифференциальное сопротивление). Негативная дифференциальное сопротивление компенсирует потери в цепи, увеличивая коэффициент Q и усиления колебательного контура.
This is unfair! You promised homebrew semiconductors, but used a commercially produced silicon transistor and germanium diode. The connection diagram of the transistor is not clear, because in the avalanche breakdown mode only the reverse-biased emitter junction works. And therefore the collector can not be used at all or can be short-circuited with the base. And so we get an interesting circuit for a detector receiver with an antenna amplifier based on a tunnel diode. :)
This is the first experiment to understand how it works and whether the transistor can be used as a zincide crystal replacement. The germanium diode and transistor can then be replaced with a homemade diode and zincide crystal. This experiment well demonstrated that the avalanche breakdown mode of transistors can be used in regenerative amplifiers and oscillators.
Avalanche mode curves of the transistor at various connections can be found on the Internet. Avalanche breakdown curves of the reverse circuit should be tested to see how the curve changes if the circuit of the transistor is changed (base-collector connected), etc.
@@ingussilins6330 I wonder how much gain this circuit has? I suspect that it is many times less than one bipolar transistor of the old series such as KT315 or similar. It is probably for this reason that tunnel diodes were very quickly forced out, first into the microwave range, and then completely.
@@ingussilins6330 Probably another reason for their departure from modern circuit design is their high noise figure. It would be very interesting to get a receiver on a homemade JFET. Unfortunately this is not possible. :(
@@user-io3yy9vp9n Sounds in headphone not strong, like a crystal radio. Weak stations I can hear near ocillation point. I picked one chinese radio station without power supply ( crystal radio mode ). About transistors base - collector short circuit - transistor turns to "zener diode", without negative resistance curve - curve similar zener diode.
With 1,2K resistor between base and collector can increase maximum oscillation freqency.
Как же он работает. Не имея S образной характеристики?
Характеристическая кривая S-типа. Приемник по сути представляет собой детекторный приемник с регенерацией. Регенерация регулируется напряжением питания (током, протекающим через транзистор). И наоборот, включений транзистор имеет падающую характеристику мА/В с переменной крутизной (переменное негативная дифференциальное сопротивление). Негативная дифференциальное сопротивление компенсирует потери в цепи, увеличивая коэффициент Q и усиления колебательного контура.
This is unfair! You promised homebrew semiconductors, but used a commercially produced silicon transistor and germanium diode. The connection diagram of the transistor is not clear, because in the avalanche breakdown mode only the reverse-biased emitter junction works. And therefore the collector can not be used at all or can be short-circuited with the base. And so we get an interesting circuit for a detector receiver with an antenna amplifier based on a tunnel diode. :)
This is the first experiment to understand how it works and whether the transistor can be used as a zincide crystal replacement. The germanium diode and transistor can then be replaced with a homemade diode and zincide crystal. This experiment well demonstrated that the avalanche breakdown mode of transistors can be used in regenerative amplifiers and oscillators.
Avalanche mode curves of the transistor at various connections can be found on the Internet. Avalanche breakdown curves of the reverse circuit should be tested to see how the curve changes if the circuit of the transistor is changed (base-collector connected), etc.
@@ingussilins6330 I wonder how much gain this circuit has? I suspect that it is many times less than one bipolar transistor of the old series such as KT315 or similar. It is probably for this reason that tunnel diodes were very quickly forced out, first into the microwave range, and then completely.
@@ingussilins6330 Probably another reason for their departure from modern circuit design is their high noise figure. It would be very interesting to get a receiver on a homemade JFET. Unfortunately this is not possible. :(
@@user-io3yy9vp9n Sounds in headphone not strong, like a crystal radio. Weak stations I can hear near ocillation point. I picked one chinese radio station without power supply ( crystal radio mode ).
About transistors base - collector short circuit - transistor turns to "zener diode", without negative resistance curve - curve similar zener diode.