13-10-2021, 09:13 AM
Hi all,
Pppenguin - thank you for the kind words of encouragement. I learned coding in a similar way, with one difference - I didn't have such a nice community to turn to.
I managed to fit the the new diode (IN60P) the same way the old diode was fitted. I replaced the Hunts capacitor inside IFT3 (0.01nF). I put the IFT3 back in and soldered in all the wires to the legs. I powered the radio and unfortunately nothing changed.
I could still do the same trick - connect the second tab of the volume potentiometer (RV1) to the legs 5 and 6 of the IFT3 and as a result get a very decent audio of BBC4, BBC Scotland and some other stations I didn't quite catch the names of.
I finally got hold of aligator clips so I could just leave them in and try to adjust volume etc. I noticed that the volume potentiometer seemed to cut off in the middle of the range as well as at both end. I found some spare brand new linear pot in my stuff and decided to replace it just to be certain that the issue isn't with the old potentiometer. The new pot is 10KOhm and the original one is 5KOhm so I put another 10KOhm resistor in parallel so that it's more like the original one. This didn't solve the problem either. I appreciate the difference in taper of those two pots and I am planning to order a 5KOhm log
I still needed to clip the 2nd tab of volume potentiometer to 5th and 6th leg of the IFT3 to hear the actual radio sound rather than just a very faint buzz.
All the old electrolytics are gone now, I put a new diode. Why does the radio work when I clip those 3 points together but doesn't otherwise? How can I divide (and hopefuly conquer) this problem? Any hints will be appreciated again.
Have a good day,
TinaRotator
Pppenguin - thank you for the kind words of encouragement. I learned coding in a similar way, with one difference - I didn't have such a nice community to turn to.
I managed to fit the the new diode (IN60P) the same way the old diode was fitted. I replaced the Hunts capacitor inside IFT3 (0.01nF). I put the IFT3 back in and soldered in all the wires to the legs. I powered the radio and unfortunately nothing changed.
I could still do the same trick - connect the second tab of the volume potentiometer (RV1) to the legs 5 and 6 of the IFT3 and as a result get a very decent audio of BBC4, BBC Scotland and some other stations I didn't quite catch the names of.
I finally got hold of aligator clips so I could just leave them in and try to adjust volume etc. I noticed that the volume potentiometer seemed to cut off in the middle of the range as well as at both end. I found some spare brand new linear pot in my stuff and decided to replace it just to be certain that the issue isn't with the old potentiometer. The new pot is 10KOhm and the original one is 5KOhm so I put another 10KOhm resistor in parallel so that it's more like the original one. This didn't solve the problem either. I appreciate the difference in taper of those two pots and I am planning to order a 5KOhm log
I still needed to clip the 2nd tab of volume potentiometer to 5th and 6th leg of the IFT3 to hear the actual radio sound rather than just a very faint buzz.
All the old electrolytics are gone now, I put a new diode. Why does the radio work when I clip those 3 points together but doesn't otherwise? How can I divide (and hopefuly conquer) this problem? Any hints will be appreciated again.
Have a good day,
TinaRotator
