- 2 -
Recoded AM9/7. DD 1965. WITHDRAWN.
Ampli ier, Filter and Voltage Divider used in front of a
voice frequency detector UN20/l for unattended working
Processing Amplifier used in MN2M/l to amplify a programme
signal and limit at a designated level, with a switch
output circuit operated at a further designated level.
CHl/12A. DD 1965. DD Spec 5.117. ACO. OBSOLESCENT.
printed circuit boards
-35dB, -32dB, -12dB,
similar to AMl/14 but consisting of
only for switching levels of -38dB,
-9dB, -6dB respectively. DD 1966.
Processing Amplifier Quadrature used on MN2M/l. Amplifies
2 programme signals and limits at a designated level and
combines the two signals in a switch output circuit
operated at a further designated level. CHl/26A.
DD 1965. WITHDRAWN.
Processing Amplifiers used in MN2M/2-6. Each comprises
two printed board amplifiers in CHl/26A as follows:-
A = AMl/14A, ~1/14D, Pegs 3, 33; B = AMl/14B, AMl/14E,
Pegs 3, 34; C ~1/l4C, AMl/14F, Pegs 3, 35. DD 1966.
DD Spec 5.117. ACO. OBSOLESCENT.
Line and Pre-fade Listen Amplifier used in EPlM/5. Line
53dB. CHl/18C. DD 1966. OBSOLESCENT.
DD 1966. CANCELLED.
178mm x l02mm
Printed circuit board
transformer. DD 1967.
L.S. Equalisation Amplifier used as a pre-amplifier with
AM8/ll. Provides lOdB gain and a choice of equalisation
to suit LS5/l, LS5/2, LS5/5, LS5/6. Z in: l5~. Z out:
60~. Powered by a 38V d.c. supply from AM8/ll. Box l27mm
DD Spec 3.469.
Two Tone Amplifier used in PAlM/56. Amplifies output from
OS2/29 for application at high impedance to line.
CHl/lSC. Pegs 12, 41. DD 1967. WITHDRAWN.
Modified AMl/2l to give approximately 6dB
output level. Used for Voice of America
DD 1969. WITHDRAWN.
Cue Programme Amplifier used to process cue programme fed
to control lines having voice frequency ringing, by
introducing a response notch at 500Hz. Printed circuit
DD Spec 3.465.