hello all
i posted this last year and they said it couldnt be done...tv breaks at far higher volume particularly during documentaries.and different channels having different volumes
the answer was quite simple, most digi boxes have an aux audio output. this i connected to a 3 op amp stage level compressor. with a fet doing the limiting.
i of course lose my remote volume control function, but ive been using this circuit for 3 weeks now and ive only needed to change the volume a couple of times.heaven.
but to get to the point, i have reached the limit of my expertise, so could i please call upon the experts to help me finalise the circuit.
i am getting a slight distortion when i drop the volume to almost nil.
due i think to a gross mismatch between the output from the digi box and the first stage of the agc.
the first stage of the agc is a non inverting op amp with the input divider of two 220 k ressisters giving an input impedance of 110 ohms.i think.the circuit needs a maximum input of 200 mv.
the output impedance from the pace digibox is unknown, presumably line, which i understand to be around 775mv at 1000 ohms, but i can get no info on this.
i have cobbled together an L pad which helps, but any suggestions on this would be much appreciated ,
regards
dougal
i posted this last year and they said it couldnt be done...tv breaks at far higher volume particularly during documentaries.and different channels having different volumes
the answer was quite simple, most digi boxes have an aux audio output. this i connected to a 3 op amp stage level compressor. with a fet doing the limiting.
i of course lose my remote volume control function, but ive been using this circuit for 3 weeks now and ive only needed to change the volume a couple of times.heaven.
but to get to the point, i have reached the limit of my expertise, so could i please call upon the experts to help me finalise the circuit.
i am getting a slight distortion when i drop the volume to almost nil.
due i think to a gross mismatch between the output from the digi box and the first stage of the agc.
the first stage of the agc is a non inverting op amp with the input divider of two 220 k ressisters giving an input impedance of 110 ohms.i think.the circuit needs a maximum input of 200 mv.
the output impedance from the pace digibox is unknown, presumably line, which i understand to be around 775mv at 1000 ohms, but i can get no info on this.
i have cobbled together an L pad which helps, but any suggestions on this would be much appreciated ,
regards
dougal