|Object Type:||Test Equipment|
|Object Name:||Signal Generator|
|Part No:||Type J Model 1|
|Year of Manufacture:||circa 1955|
|Location:||Rack RAA07 [Main Store]|
Advance Components Ltd.
L.F. Signal Generator Type J Model 1
Ser. No. 2104
Mains 105-125: 210-250V. 40-100 ~
FCD ASSET NO:
3P 233 1C
The Type J signal generator provides 1Watt output into 600 Ohms isolated from earth over a frequency range of 15Hz to 50kHz. A 5ohm source is also provided giving a maximum output of ½ watt.
Basically the circuit consists of a Wein resistance-capacitance bridge type oscillator switched in three ranges, followed by a triode driver stage and pentode output stage working into the output transformers T1 and T2. Output transformer T2 is used only for the high frequency range A, and is selected by S1. The power supplies are derived from a full-wave rectifier using resistance/capacitance smoothing, and from a low voltage winding supplying the valve heaters. The stabilisation of the oscillator and the feedback on the output stage provide a constancy of output with varying frequency of +/- 2db. The output is controlled by a calibrated potentiometer
The instrument is mains powered ECC88 valves/tubes