G
Guest
Guest
A very kind soul has scanned the schematic and related documents (testing documents) for me
pm me with your email for me to pass it on
It's a broadcast preamp
Input -20db to -75db in 10db steps
output -20db 0db
can include a 15.625hz notch filter to get rid of picture noise from a 625 line screen (-40db cut)
bass cut filter
output muting (>80 db)
+/-12v 25mA
BCY71, BC109, Input (1:3.5) /Output (1:2) transformers
the next bits are stuff I don;t understand but I will include it for those cleverer than me
noise figure >4db at 300 ohm load at maximum gain
distortion 0.1% with output of 16db into 12kohm load at 1Khz
pm me with your email for me to pass it on
It's a broadcast preamp
Input -20db to -75db in 10db steps
output -20db 0db
can include a 15.625hz notch filter to get rid of picture noise from a 625 line screen (-40db cut)
bass cut filter
output muting (>80 db)
+/-12v 25mA
BCY71, BC109, Input (1:3.5) /Output (1:2) transformers
the next bits are stuff I don;t understand but I will include it for those cleverer than me
noise figure >4db at 300 ohm load at maximum gain
distortion 0.1% with output of 16db into 12kohm load at 1Khz