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Jolly 7 · 27th Dec 2018, 12:44 pm

Ian and Graham, thanks for your guidance with the correct settings for my RF-1U signal generator. I heard no output from the radio after connecting the test probes to the centre of the volume control pot and the earth of the PCB. Just to verify that my signal generator is working, I connected it directly to the speaker and could hear a tone.
This therefore makes me think if one or both of the audio output transformers could be faulty. I did test the audio preamp and output 2N2222 transistors before soldering them in and they were fine.

27th Dec 2018, 12:44 pm	#64
Jolly 7 Octode Join Date: Feb 2018 Location: Southampton, Hampshire, UK. Posts: 1,061	Re: More Chinese AM radio kits Ian and Graham, thanks for your guidance with the correct settings for my RF-1U signal generator. I heard no output from the radio after connecting the test probes to the centre of the volume control pot and the earth of the PCB. Just to verify that my signal generator is working, I connected it directly to the speaker and could hear a tone. This therefore makes me think if one or both of the audio output transformers could be faulty. I did test the audio preamp and output 2N2222 transistors before soldering them in and they were fine.