However, should the DIY ham radio constructor wish to change the frequency settings, just run the BBC Basic CAD program and change the values of C_one and C_two for the preferred chosen equalisation audio signal requirements. However the next resistor pot on its right hand side, call this pot number two, here C_one and C_two are 4.7nF and 180nF for the 605Hz AF signal equalisation control setting, and so on from pots No:Hz setting, No:Hz setting and finally pot No:5, the 3116Hz control setting, and thus the appropriate C_one and C_two values as listed in the tabled values. Starting say from the left control resistor pot, call this pot number one, this maybe setup for the 311Hz band equalisation control of the audio signal, with C_one and C_two are 32nF and 100nF. The tabled results of C_one and C_two relate to the band pass filtering of the 100K ohm variables resistor pots. However I did look up the data sheet for the chip design, and as I had lost my copy, I then proceeded to write up a BBC Basic code CAD program for calculating the capacitor values. Now I did have a practical wireless magazine purchased from my local news agent, but unfortunately I have some how at the moment miss-layed my copy of this month.
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