Page 1 of 1

NRGkitz or Veronica 50mW circuit diagram

Posted: Thu Oct 03, 2019 6:09 pm
by Gigahertz
Just wondering if any of you guys have a copy of either the Veronica or NRGkitz 50mW transmitter design.

Re: NRGkitz or Veronica 50mW circuit diagram

Posted: Thu Oct 03, 2019 10:50 pm
by teckniqs
I haven't but back in the day I heard it was a decent little kit and works very well for what it is.

Re: NRGkitz or Veronica 50mW circuit diagram

Posted: Fri Oct 04, 2019 4:39 pm
by Gigahertz
Had both versions years ago and they were decent units. Just wanted a evening project for a bit of fun.

Remember Kanga had a brief encounter with NRG but just spoken to the guy to see if he had any documentation left but it all went on to guys in London and Blackpool 🤔

Re: NRGkitz or Veronica 50mW circuit diagram

Posted: Fri Oct 04, 2019 4:57 pm
by 1608cc
Image

Image

Many years ago Polish pirates made their own version called "NRGv6". It's better than original :D

Image

Image

Standard version :

Image

Micro version :

Image

Re: NRGkitz or Veronica 50mW circuit diagram

Posted: Fri Oct 04, 2019 5:33 pm
by Gigahertz
1608cc, top man thank you 👍

Re: NRGkitz or Veronica 50mW circuit diagram

Posted: Sun Oct 06, 2019 7:18 am
by radium98
done a few years before .two bf494

Re: NRGkitz or Veronica 50mW circuit diagram

Posted: Wed Oct 09, 2019 4:12 pm
by Bton-FM
It is in the file

Re: NRGkitz or Veronica 50mW circuit diagram

Posted: Thu Oct 10, 2019 12:51 am
by Albert H
I used to build something similar, but using a pair of FETs to really lightly load the tuned circuit. I also experimented with etched coils, but the best results were obtained with a single 12 turn coil, with taps every two turns. The coil was fiddly to make, but when you've made a couple of them, you get the hang of it. The oscillator is remarkably stable and very clean. It's a sort of first cousin of the "Kallitron" oscillator, which I first saw in a G2DAF communications receiver design. The basic version of the circuit was stable to within 100 Hz for an hour at 30 MHz, but adding a "huff and puff" stabiliser was really worthwhile because it would then stay on tune indefinitely.

Re: NRGkitz or Veronica 50mW circuit diagram

Posted: Wed Oct 23, 2019 4:46 pm
by Bton-FM
where can I buy BF494's?

Re: NRGkitz or Veronica 50mW circuit diagram

Posted: Wed Oct 23, 2019 5:57 pm
by radium98
Bf495 bf199 all work

Re: NRGkitz or Veronica 50mW circuit diagram

Posted: Wed Oct 23, 2019 6:32 pm
by Bton-FM
Thanks radium :tup

Re: NRGkitz or Veronica 50mW circuit diagram

Posted: Wed Oct 23, 2019 8:44 pm
by Gigahertz
Might be missing it on circuit diagram on both but it states VCD1 on standard and on micro it has VC1 & VC2 but what values are theses ?

Re: NRGkitz or Veronica 50mW circuit diagram

Posted: Wed Oct 23, 2019 11:07 pm
by 1608cc
VC1 : 22pF green film trimmer (Philips, BC components or now Vishay)

VD1, VD2 : BB809, BB409, BB109, BB329, BB529, KB109 (KV1310 only for ori NRG)

It is described in "wykaz elementów generatora.doc" in nrg6 folder ;)

Re: NRGkitz or Veronica 50mW circuit diagram

Posted: Thu Oct 24, 2019 7:26 am
by radium98
bb105 x 2 facing cathode ,bb204 any vhf varicap will suite .

Re: NRGkitz or Veronica 50mW circuit diagram

Posted: Thu Oct 24, 2019 7:36 am
by 1608cc
radium98 wrote:
Thu Oct 24, 2019 7:26 am
bb105 x 2 facing cathode ,bb204 any vhf varicap will suite .
Unfortunately not... BBxx9 has higher capacitance... There were tests and You need to put 2 BB105 (even 3 to cover all 88-108 band, if You want to use PLL) in parallel instead one BB809. And also sound quality will drop - only BBxx9 offers the best parameters (same loud on 88 and 108, low noise ratio). Circuit was originaly matched to BB809 not BB105/204.

Re: NRGkitz or Veronica 50mW circuit diagram

Posted: Thu Oct 24, 2019 8:33 am
by Albert H
A friend of mine built one of these the other day (as a baby alarm) and just used reverse-biased LEDs for the varicaps. He painted them black to prevent light affecting the frequency (and adding mains hum to the modulation). He had to add a single transistor audio amplifier stage to get enough modulation from an electret microphone. He tuned it to 85 MHz and uses a Japanese band portable to monitor his new daughter!