|
Grew up with Electronics Hobby Magazines
Record of Updates:
7-1-2014 Added a low filament voltage sensitive regenerative radio
10-23-2011 Added Japanese original types of tubes.
3/14/10 Added some new items. Sorry for limited English explanations for the new ones.
WARNING: In case you build equipment/gadget listed here, I would be happy to help you do so by giving you advices by e-mails as long as my time and knowledge allow. However, I cannot guarantee that the equipment/gadget will work to your satisfaction. Also, there are lethal high voltages (as high as 800V) involved in some of the equipment. Please build any of those very carefully AT YOUR OWN RISK.
��1��Photographs of the Equipment/Gadgets I Built
��1.1��Radio Receivers
��Regenerative Radio that works at about 2.5V filament and at 3.6V B voltages!
Mt. O, a friend of mine, discovered that a plain regenerative detector circuit is very sensitive when the detector tube's filament voltage is about half of its rated voltage even at very low plate voltage.
��Two IC Little Radio
The size is 50��35��25mm but still with a built in speaker! The ICs used are the LMF501(equivalent of the UTC7642 but with different pin asignment) and the TDA2822M with BTL connection for low voltage operation.
��Regenerative radio = Copy of a kit once sold by "Kagaku Kyouzai-sha".
The parts layout and wiring is very similar to those of the kit. The kit was popular among the boys in the 1960's and early 1970's. This one is with a power transformer. To compare with the ones below that are power transformer-less.
........
(eom)
'라디오 보이 블로그' 카테고리의 다른 글
| 금성 라디오 A-501 연구 '듣다, 상상하다' (0) | 2022.03.08 |
|---|---|
| (일본) Dad's project (0) | 2016.02.06 |
| (일본) 라디오 페이지 (0) | 2015.12.27 |
| (일본) 라디오를 만들자 (라디오 공작) (0) | 2015.12.27 |
| (홍콩) 라디오 보이 (0) | 2015.12.15 |