Am montat și eu în tinerețe vreo 3 bucati, mergeau super, singurul inconvenient era cu alimentarea la 9v, bateriile erau slabe pe atunci, nu țineau mult... Cu aceste montaje( mai era și iunosti tot rusesc, și multe altele produse de iprs) am prins dragul de electronica, era o adevărată satisfacție când prindea un post, după care începeam tatonatul spirelor de pe ferita pentru audiție maxima!
Am gasit si un Iunosti nefunctional pe net, isi asteapta randul la reconditionare... Cred ca multi dintre pasionatii de electronica au inceput cu astfel de kit-uri, fie de IPRS, fie sovietice. Acum China a preluat stafeta, sunt multe kit-ui chinezesti atractive pentru pasionati. 73!
I build my first radio somewhere at the end of the 70's when i was about 10. Indeed with a germanium transistor (AC125) and regenerative. Manny projects have passed since.
It is a bit harder to look at that schematic with the negative rail up on top and the positive rail on the bottom. If I am looking at it right, there is no regenerative feedback, nor is there an IF stage. I would expect the reception sensitivity of this radio to be quite limited, and it seems like a lot more could have been done with that many transistors.
Back in the days, in the germanium era, when they were using mainly PNP transistors, the positive lead was the "common", only with the silicium devices the "chasis" became negative. Of course that with 7 transistors you can make a superheterodyne, but those kits were made for kids, they had no knowledge nor lab equipment to set up an intermediate frequency or a local oscillator. These receivers were intended for local broadcast stations, not for DX...
@@perianmarcel2059 Great info! I work with leading edge technology but really love the old stuff, including designing with vacuum tubes. Thanks for posting such an interesting video!
The antenna signal is applied between the Base and Emitter of V1, so it will have the same amplification as common Emitter stage although the amplified signal is present on its Emitter.
Audio modulation of the RF carrier causes corresponding current change through V3 which causes audio signal voltage to develop across V3's Collector load resistance including the volume pot. The capacitors filter out the RF.
@@xavieraxiak6866 Thanks Xavier, that's like the old "anode bend" valve radio detectors from long ago. Thought there might be more signal with a diode, but obviously it works!
The radio that I have : ( made in USSR ! ) has these large black painted transistors , ALL in plug in sockets ... possibly to reduce any damage by the hot solder process ? ? ........................ DAVE™🛑
Am montat și eu în tinerețe vreo 3 bucati, mergeau super, singurul inconvenient era cu alimentarea la 9v, bateriile erau slabe pe atunci, nu țineau mult...
Cu aceste montaje( mai era și iunosti tot rusesc, și multe altele produse de iprs) am prins dragul de electronica, era o adevărată satisfacție când prindea un post, după care începeam tatonatul spirelor de pe ferita pentru audiție maxima!
Am gasit si un Iunosti nefunctional pe net, isi asteapta randul la reconditionare... Cred ca multi dintre pasionatii de electronica au inceput cu astfel de kit-uri, fie de IPRS, fie sovietice. Acum China a preluat stafeta, sunt multe kit-ui chinezesti atractive pentru pasionati. 73!
Nu ai canal și în Romania
Этот приёмник был один из лучших среди не супергетеродинов. Потом появилась разработка Верютина, на кремниевой базе, более чувствительная, устойчивая.
Возможно, когда-нибудь попробую Верютину...
I build my first radio somewhere at the end of the 70's when i was about 10.
Indeed with a germanium transistor (AC125) and regenerative.
Manny projects have passed since.
This is some good classic stuff!
Very interesting device
Excellent.
What is a good substitute for the P401 transistors?
2SA268, 2SA269, 2SA352, GT311, 2N1585, GT321, EFT317, EFT319
This circuit with strong DC bias circuit ( resistor divider ) can works with silicon or germanium transistors.
Спаял такой набор в 1980 году.
It is a bit harder to look at that schematic with the negative rail up on top and the positive rail on the bottom.
If I am looking at it right, there is no regenerative feedback, nor is there an IF stage. I would expect the reception sensitivity of this radio to be quite limited, and it seems like a lot more could have been done with that many transistors.
Back in the days, in the germanium era, when they were using mainly PNP transistors, the positive lead was the "common", only with the silicium devices the "chasis" became negative. Of course that with 7 transistors you can make a superheterodyne, but those kits were made for kids, they had no knowledge nor lab equipment to set up an intermediate frequency or a local oscillator. These receivers were intended for local broadcast stations, not for DX...
@@perianmarcel2059 Great info! I work with leading edge technology but really love the old stuff, including designing with vacuum tubes.
Thanks for posting such an interesting video!
The antenna signal is applied between the Base and Emitter of V1, so it will have the same amplification as common Emitter stage although the amplified signal is present on its Emitter.
How is the detection done? Was expecting a diode somewhere.
Audio modulation of the RF carrier causes corresponding current change through V3 which causes audio signal voltage to develop across V3's Collector load resistance including the volume pot. The capacitors filter out the RF.
@@xavieraxiak6866 Thanks Xavier, that's like the old "anode bend" valve radio detectors from long ago. Thought there might be more signal with a diode, but obviously it works!
The radio that I have : ( made in USSR ! ) has these large black painted transistors , ALL in plug in sockets ... possibly to reduce any damage by the hot solder process ? ? ........................ DAVE™🛑
I don't know why they were using those sockets in the early transistor devices, maybe was just a habitude that remained from the tube era...
Ahh germanium transistors, wasn't it good to be young
Сейчас из этой коробочки выскочит Путин и отправит аффтара в ГУЛАГ. "Коммунистическая эра" поглотит автора ролика. Безумная смелость с его стороны.