What an interesting receiver and good results for a simple circuit. I particularly like the construction method. Could you possibly do a short video on where to source components such as valves and the holders with any tips on what to look out for and importantly, what not to buy? Thanks.
Thanks for the suggestions. Interesting. Of course a lot depends on where one is in the world! Ironically, the easiest items to obtain are usually the valves. Why? Well historically, someone might throw away an old set, but make sure they keep the valves, but not the valve holders, transformers, variable capacitors etc. I will certainly give this idea of your some serious thought.
Thank you very much indeed for your sharing of your expertise. I have never seen this much detailed crucial things of teaching and sharing candidly on the project like this.
Hi. I'll be honest that I haven't really considered doing this as there are many other people giving this kind of detail in their videos already. I'm assembling many of these videos because there are far too many 'tried and tested' circuits and ideas out there on the Internet that have had neither done. Mine are therefore realistically as short as possible, but show that here's a circuit that actually works. (Useful as well, as you can see what performance to expect if you make your own) The same applies to my microprocessor videos. Lots of these out there already, often with hugely complex circuits and programming, or simply 'ideas' that are probably above most peoples heads. I therefore do mine from the ground upwards, describing any detail necessary for the beginner to actually have the enjoyment of making a micro. work for them.
It is indeed, hence the regeneration (reaction /tickler) control. Without this there would probably be no reception, unless one used a seriously good, high aerial.
As this only has one waveband, I tried to make it work for some well listened-to bands. In the end, by taking into account the fact that I was going to use a 50pF tuning capacitor, I adjusted the coil windings to give me about 5.9 - 8 MHz. This therefore encompasses the 41 and 49 Metre broadcast bands, plus the 40 Metre amateur band. A larger tuning cap. would have increased this coverage if it had been built with one.
Do let me know how well it works. If you tweak the number of turns on the aerial coil, then you can probably tailor it to your exact needs. Do take note that if you increase the size of the tuning cap too much, it will be much more difficult to tune if you want to keep the small case footprint. Tuning in SSB signals even now is a bit of a challenge!
@@lishaton I have a 36mm small VERNIER DIAL. It rotate 4 times when the capacitor rotates 180 degrees. I think it's helpful for turning. May I ask what ferrite you use for the coil? Is it medium wave antenna ferrite? Thank you.
Yes, it's a short length of an ordinary medium wave or long wave ferrite rod aerial. i.e. nothing special. That vernier should make tuning much easier if you want to increase the size (capacity) of your tuning capacitor.
What an interesting receiver and good results for a simple circuit. I particularly like the construction method. Could you possibly do a short video on where to source components such as valves and the holders with any tips on what to look out for and importantly, what not to buy? Thanks.
Thanks for the suggestions. Interesting. Of course a lot depends on where one is in the world! Ironically, the easiest items to obtain are usually the valves. Why? Well historically, someone might throw away an old set, but make sure they keep the valves, but not the valve holders, transformers, variable capacitors etc. I will certainly give this idea of your some serious thought.
Another great video. Thanks, Clare
Aw - thanx Clare!
Thank you very much indeed for your sharing of your expertise.
I have never seen this much detailed crucial things of teaching and sharing candidly on the project like this.
What a really nice bit of feedback. Thank you! :-)
Will you do videos on the theory/maths of circuits?
Hi. I'll be honest that I haven't really considered doing this as there are many other people giving this kind of detail in their videos already. I'm assembling many of these videos because there are far too many 'tried and tested' circuits and ideas out there on the Internet that have had neither done. Mine are therefore realistically as short as possible, but show that here's a circuit that actually works. (Useful as well, as you can see what performance to expect if you make your own)
The same applies to my microprocessor videos. Lots of these out there already, often with hugely complex circuits and programming, or simply 'ideas' that are probably above most peoples heads. I therefore do mine from the ground upwards, describing any detail necessary for the beginner to actually have the enjoyment of making a micro. work for them.
so this is a REGEN ? like the build tho for sure
It is indeed, hence the regeneration (reaction /tickler) control. Without this there would probably be no reception, unless one used a seriously good, high aerial.
Nice video. What is the frequency range? Thank you.
As this only has one waveband, I tried to make it work for some well listened-to bands. In the end, by taking into account the fact that I was going to use a 50pF tuning capacitor, I adjusted the coil windings to give me about 5.9 - 8 MHz. This therefore encompasses the 41 and 49 Metre broadcast bands, plus the 40 Metre amateur band. A larger tuning cap. would have increased this coverage if it had been built with one.
@@lishaton Thank you for your reply. 5.9-8MHz is good. I will try to build one and maybe add 2 bands.
Do let me know how well it works. If you tweak the number of turns on the aerial coil, then you can probably tailor it to your exact needs. Do take note that if you increase the size of the tuning cap too much, it will be much more difficult to tune if you want to keep the small case footprint. Tuning in SSB signals even now is a bit of a challenge!
@@lishaton I have a 36mm small VERNIER DIAL. It rotate 4 times when the capacitor rotates 180 degrees. I think it's helpful for turning. May I ask what ferrite you use for the coil? Is it medium wave antenna ferrite? Thank you.
Yes, it's a short length of an ordinary medium wave or long wave ferrite rod aerial. i.e. nothing special. That vernier should make tuning much easier if you want to increase the size (capacity) of your tuning capacitor.
спасибо хорошая работа
Thanks for that.
4'35" is China Radio in Esperanto. What were the chances of your video being seen by someone who speaks it? ;-)
Extremely unlikely methinks... :-)