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Old 4th Dec 2017, 3:17 pm   #28
Neil Purling
Nonode
 
Join Date: Jul 2005
Location: Hull, East Yorkshire, UK.
Posts: 2,083
Default Re: Two or three IF stage Chinese radio kits.

I did find that the signal at the detector was clean.
I have managed to test a bagful of 2N3904 and get two that were close.
I am building another of the 6 transistor radios. I will be using the trimmer in place of R4 & those matched transistors as VT5 & VT6.
Are there any other modifications I might incorporate to improve the audio stage?
I think that those speakers with the very low-profile plastic frame & disc-like cone are pretty poor.
Has anyone made one of these radios with a substitute 70 mm speaker?

For Winter construction I have two different 3-stage radios on the way: A HX108-2 and BS618. Both have push-pull outputs with two transformers. I will probably have questions when I get to the HX108-2 because the diagram seems to have at least one mistake.

Last edited by Neil Purling; 4th Dec 2017 at 3:26 pm.
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