Equipment/BBC AF signal generator: Difference between revisions

Equipment/BBC AF signal generator (view source)

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 This belongs to Russ. You can use it but Russ will be grumpy if it gets damaged.
-Quickstart to produce an audio tone: select 100-100K range, Frequency dial at 6 gives roughly middle C (720Hz).
+Quickstart
-Gain knob on rear at 2. Front output knob up 20 degrees. Sweep off. modulation off.
+To produce an audio tone:
-Rear on/off switch on. Front on/off switch on.
+Connect a small loudspeaker to the binding posts at rear
+Select 100-100K range
+Frequency dial at 6 gives roughly middle C (720Hz).
+Gain knob on rear at 2
+Front output knob up 20 degrees
+Sweep off
+Modulation off.
+Rear on/off switch on
+Front on/off switch on
+Tone should be heard in the loudspeaker.
 '''
-[[Beware]]''' This unit has a built in amplifier. The loudspeaker terminals on the back can produce up to 40volts pk-pk. You can blow up things like computer audio inputs!
+[[Beware]]''' This unit has a built in amplifier. The loudspeaker terminals on the back can produce up to 40 volts peak to peak and a lot more current than a typical 600ohm signal generator output. You can blow up things like computer audio inputs!
+Controls
+Front panel
+Frequency Control
+This is a three turn potentiometer, the markings on the dial bear little relationship to the output frequency but the control is smooth and noise free.
+Frequency Range
+Four ranges, 0.1Hz-100Hz, 1Hz-1kHz, 10Hz-10kHz and 100Hz-100kHz.
+Output Level
+Adjusts level at PO jack at rear and drive to amplifier.
+Output On/Off
+Sweep Rate
+Four sweep speeds, 0.1,0.2, 0.5 and 1 octave/sec.
+Sweep On/Off
+Starts a single sweep from the current setting of the Frequency Control down the scale to the low frequency of the selected range. To initiate another sweep return the switch to Off and then On again.
+Modulation Frequency %
+Four values, 1, 2, 5 and 10%
+Peak Deviation
-The loudspeaker terminals on the back can produce a lot more current than a typical 600ohm signal generator output.
 The low level audio output requires a quarter inch jack plug (it might need a PO316 plug, as used on studio patch bays, rather than a standard 1/4" jack). There isn't one handy with the unit.