09-04-2022, 04:31 PM
Hi everyone,
I've bought a Roberts RD50 with a very tatty covering. It has very low volume on both FM and DAB. The amplifier is an unusual device, a AN7142 fed by a NJM2100L package which contains a pair op amps. It's not the earphone socket at fault....
Working from the manufacture's generic specs both of the above chips seem to have the sort of pin voltages I would expect. I'm trying to find my signal injector which has hidden itself somewhere to see how the amplifier reacts to a direct input. Most of the components are SMD. I've searched for a circuit diagram and I can't find much about this model. I do have a circuit for the Roberts RD60, but that seems a different and much more sophisticated set with a different layout and different amplifier.
Does anyone have a circuit of the RD50 which I could have please?
Thank you.
SM
I've bought a Roberts RD50 with a very tatty covering. It has very low volume on both FM and DAB. The amplifier is an unusual device, a AN7142 fed by a NJM2100L package which contains a pair op amps. It's not the earphone socket at fault....
Working from the manufacture's generic specs both of the above chips seem to have the sort of pin voltages I would expect. I'm trying to find my signal injector which has hidden itself somewhere to see how the amplifier reacts to a direct input. Most of the components are SMD. I've searched for a circuit diagram and I can't find much about this model. I do have a circuit for the Roberts RD60, but that seems a different and much more sophisticated set with a different layout and different amplifier.
Does anyone have a circuit of the RD50 which I could have please?
Thank you.
SM
