Another 7 MHz ceramic resonator regenerative receiver (receiving DX signals)

Another regenerative receiver using a ceramic resonator VXO. Pretty much the same as before except using an audio amplifier IC to drive a speaker.
Ceramic resonators available at www.minikits.com.au/components...
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[@radiofun232]

Beautiful! Perfect project with good results. Thanks for publishing the schematic.

[@Radionut63]

Very cool setup, must give it a try, thanks for supplying the circuit.

[@CARL557511]

Very nice receiver Peter. Sounds great!

[@IvanPassos]

Excellent regenerative receiver thank you

[@raafatalheety826]

Very nice sound

[@dxexplorer]

I think if you replace the 22nF capacitor that's before the audio amp with another 100nF capacitor, it may cut a little of the high frequencies even though it may cut a little of the audio signal strength as well... but you will have much more pleasant sounds for CW. That's what I did on mine and it sounds wonderful. 73 Peter.

[@M0JLY]

Thanks for sharing Peter I must have a go at this it's very good I have just built the GQRP regen from Kanga UK and this looks like a break through in regens a stroke of genus on your part :)

[@raafatalheety826]

Very nice receiver and very simple circuit .nice sound I think add another c.r 3.6 mhz. and 14.3 mhz

[@sapahsapah5929]

الاخ رأفت الهيتي متى يكون عندنا أجهزة مثل هذه الدول وليس عندنا معاهد تدريسية والعراق يبقى متأخر ولا توجد حريه لشعبه بهوايت هذه الاجهزة عالية النطاق.

[@m0dad]

Hi Peter,I must dig out my old homebrew regenerative receiver and replace some of the parts I borrowed. I like your design much better, great results from a simple circuit and very stable. 73 M0DAD

[@hosseinpersian6444]

very simple and interesting . thank you for sharing .73!

[@raafatalheety826]

Good morning peter . why don't but pre amplifier before the LM386. ???.all your circuit don't but pre amplifier in the audio stage .I but 1 transistor BC548 before the LM386 it is very good .

[@Dan40049]

Excellent!!

[@VK4LA]

Nice Peter...

[@4youian]

Hi Peter, I tried this circuit with a 40MHz fundamental crystal and an S9018 RF transistor (for a proposed simple up-conversion receiver) and it works but there is no actual amplification from the regenerative detector itself. When using a signal generator the signal disappears below about 1mv for a pure tone or more like 10-100mv for an AM modulated signal. That's the signal directly into the regen with about 40db audio amplification. Is this regen detector meant to amplify as well as detect? It does work well with larger signals but definitely needs a preamp at this frequency. Thanks, Ian

[@hickboxgames]

VERY COOL!

[@ingussilins6330]

Made hand held enclosure and insert miniwhip circuit.... Best pocket receiver variant! 73

[@oliverfranklypartolesen9882]

I have build your circuit after your schematic. But does the lm386 not need some components as volume control like that or maybe I acts like preamplifier I don't know

[@oliverfranklypartolesen9882]

I can't get it into oscillating mode but I can hear the audio amp and if I turn regeneration control I only control gain no signal squirrels

[@rajesh00ify]

Hi, I couldn't​ find ceramic resonators. Can I use crystals instead. I may sound silly but pl. help me. Thank you.

[@rpcomms1]

Hi Peter,could we use a 455khz resonator as a fixed I.F Stage\Detector stage using super regen for AM\SSB detector.I would use selectable pots for Am,SSB modes on regen. It would be possible to use in a superhet design,with audio agc control? what you think peter?

[@jmitsch44827]

CAN THIS CIRCUIT WORK WITH VARACTOR TINNING AND A CERAMIC RESONATOR ???

[@oliverfranklypartolesen9882]

Okay why it doesn't need an preamplifier before lm386

[@BOCAHNDESO]

4 mhz work or not?

[@fernando_k5257]

I liked it very much (PY2FZU)!

[@ernestomarquez1036]

I can't find the BC 548 transistors locally here in the states. What substitute transistor may I use instead? Would a 2N2222 be OK? Love the ruggedness of such a simple design,

[@vk3ye]

+Ernesto Marquez yes

[@weirdsciencetv4999]

Your designs are just brilliant. Could a helical or coaxial resonator be used? I wanted to make a 315 MHz super regen

[@vk3ye]

Possibly. Haven't tried it.

[@oliverfranklypartolesen9882]

Okay which do you have any link ;-)

[@hs1754]

Very good! 73'

[@chronobot2001]

Would it be possible to filter the audio to get rid of that 5k peak? I find it unbearable.

[@TheDavidnewkirk]

"Pulling" is not change in the detector frequency with regeneration adjustment, that's "pushing" -- a term from professional communications design not commonly used by hobbyists of any oscillator. "Pulling" is the phenomenon by which the frequency of a running electronic oscillator, in this case an oscillating regenerative detector, is pulled toward, sometimes even into, synchronization with an injected signal that's nearby in frequency to that of the running oscillator. to make a regenerative detector more resistant to pulling, use a low-Z tank circuit (X of L and C 100 ohms or less at the operating frequency); to minimize pulling, keep the level of signals fed into the detector as low as practicable for the type of reception sought. (Non-oscillating detectors need much higher input signal levels to work well, but they don't frequency pull, either. :-) )

[@MickLBrad]

Is it possible to add additional resonators to make it a multi-band receiver?

[@vk3ye]

+Mick Bradford Yes

[@oliverfranklypartolesen9882]

I have built the receiver now but I need to solder the lm386 on it but can you tell me pin numbers and where's the components at pin5output in scematic

[@vk3ye]

Just google ''LM386 amplifier circuit' for info.

[@flat5flat9flat13]

I would want to power it with a 9v battery. Would some resistors have to be changed? Which ones, would you think?

[@vk3ye]

You should be able to get away with no resistor changes

[@fredriko.zachrisson9711]

Hey. I am trying to make an external BFO but it does not oscillate. What can i do?

[@vk3ye]

Check wiring and if not successful try other oscillator circuits. Some don't work with all variations of LC values. Change feedback component values or coil tapping points if applicable.

[@oliverfranklypartolesen9882]

Okay can you describe which ceramic filters of them I can use I will buy them soon I have an 3.58

[@vk3ye]

Link to supplier in text above - from minikits.com.au

[@oliverfranklypartolesen9882]

hi Peter i have all parts now but the potentiometer are a 100k is it possible that way should I change some values now. another thing. are the variable capacitor value critical or not many regards oliver, 😁 I am ready to solder it up now

[@vk3ye]

Oliver - values shouldn't be that critical.

[@hamradioandmorehamradioand2447]

Thanks to the great initial idea by vk3ye, sv3ora has extended it to a far better level, but without making it much more complex. See his page qrp.gr/regenrxcer/ for the two improved versions of the receiver. The one at the beginning of the page is the bare bones version, and the one at the bottom, is the special one. Both versions, include a much better and quieter headphone preamplifier. The special version includes a simple but good performance SSB and narrowband CW filter. There is also no audio oscillation at extreme regeneration values in his version, compared to the vk3ye one. His receiver uses a varicap, which eliminate hand effects, it is cheaper and it can be controlled with precision without special verniers. This is indeed a USB RX without any coils or variable capacitors, and it is a great performer! I have built it and with just 3 resonators, I could cover the hole 40m region 1 band without gaps. Believe it or not, the performance is so good, that I have abandoned listenning to the 40m band using my IC-728. This ultra simple homemade RX is just so much quieter, like the modern $$$$ rigs.

[@frequencywatchers]

I Wish I Could Make Such A Thing, Sadly I Cant, I Don`t Know How

[@oliverfranklypartolesen9882]

hey can I use an 7.2 mhz resonator or an 3.58 mhz I like your channel many good circuits sir ;-)

[@vk3ye]

No. But you can get ceramic resonators for various frequencies in the 3.5 MHz band.

[@kokot_usaty]

Do you think i could get away with a crystal instead of the ceramic resonator?

[@vk3ye]

Maybe. It won't be very frequency agile though.

[@user-uu6sw6fi6w]

Peter, some sofware on your phone?

[@vk3ye]

+Nick Hamster FrequenSee

[@oliverfranklypartolesen9882]

It won't oscillate what can I do Peter 😂

[@ka8syv203]

Excellent video! 73 de ka8syv Frank

[@oliverfranklypartolesen9882]

m.kzbin.info/www/bejne/g37RhmioqdylfpI my version does the layout look fine enough I keep all wire short and build tight this time it not fills more than a matchbox hehe I hope it will work when I have soldered it