Nida 444 Service Manual also for Protek B-801, DFG-600 and 8205A

No longer available on eBay. Contact me at [e-mail].
Nida 444 Sweep Generator Service Manual also for Protek B-801 and JDR Instruments DFG-600 and Hung Chang 8205A.

[@coldcathode76477]

I’m glad I ordered your manual: it arrived yesterday and I have to say it’s extremely detailed and very well done. With it I could even build one from scratch… if the 444 was worth the effort and I didn’t already have one… Jokes apart, you did a really nice job, thank you. 73 de HB9DUL.

[@jerryw9fs]

Wow, I have had to reverse engineer a few items to repair units in the past, but never to this extent. Hats off to you sir. Very well done! W9FS

[@charlessmith833]

I have updated the schematic to show the diode cluster drawn as a bridge circuit, which it truly is. Now it makes more sense. Yes, it was a challenge to make such an intricate schematic. Years ago, I reverse engineered computer boards which used tons of 14 and 16 pin IC's. I won't do that again. Anyway, thanks for your comment.

[@jerryw9fs]

@@charlessmith833 Years ago I worked for Richard Bagan Co. They repair any and all industrial electronic equipment they had a test station that would take circuit board up to 20 inches or so square and was comprised of several pins tied to a computer and if you layed a board on the table it would give you a wire map. Worked with multilayered boards. Still you did this the hard way and I commend you.

[@microreniassance2929]

This is a great thing! I've dm'd you to order a manual. Hope they are still available.

[@Dullthud007]

Thanks for this. I think it's also a Precision Gold M205 sold by Maplin (now defunct) in the UK. They only stated 20v p to p though. Real learner about this stuff and didn't know if it was worth a bid. Looks like it might be a good basic starter.

[@youngwug]

It is helping a lot.
Items are not sold on eBay.
There is no way to purchase.
Please take a picture of the circuit diagram, parts list and layout for detailed adjustment.
It is wonderful.

[@charlessmith833]

You can contact me at [e-mail]

[@charlessmith833]

Q8 transistor is shown in error. It is actually a N-FET. I have made the correction on the drawings. Thanks.

[@HanakPavel]

This generator was also sold as Hung Chang 8205A.

[@charlessmith833]

Thanks. I appreciate the comment. I will add it to the list.

[@tiromancino_tt]

great job !

[@Dolvid]

Charles can you provide a link to the manual available on eBay?

[@charlessmith833]

Contact me at [e-mail]

[@lutetube88]

Hi, thanks for the video. I tried to email you from the address above but it doesn't work. Has it been changed?

[@charlessmith833]

my email address is under the video