Mullard Pupil's Oscilloscope
by Parcgwyn in Circuits > Electronics
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Mullard Pupil's Oscilloscope
This instructable describes the construction of a extremely simple 12v oscillosope.
The diagram below is a schematic of the Mullard pupil's oscilloscope. This is a single valve (+CRT) oscilloscope that is about as simple as an oscilloscope can get. The Mullard scope is described in the Radio Basics column of Practical Wireless March 2005.
The diagram below is a schematic of the Mullard pupil's oscilloscope. This is a single valve (+CRT) oscilloscope that is about as simple as an oscilloscope can get. The Mullard scope is described in the Radio Basics column of Practical Wireless March 2005.
Transformer Winding
The transformer was home wound on a ferrite core that I had handy and an aluminium clamp fabricated to enable it to be fixed to the chassis.
Transformer Winding Details:
L1,L4 12 turns 26 swg
L2,L3 3 turns 26 swg
L5 450 turns 36 swg
Transformer Winding Details:
L1,L4 12 turns 26 swg
L2,L3 3 turns 26 swg
L5 450 turns 36 swg
Construction
Below are pictures of the oscilloscope during construction and completed. The scope shown above did not include the X attenuator potentiometer shown in the circuit diagram. I also added a 68pF capacitor between the Y amplifier anode and the supressor grid of the timebase pentode to provide a sync. signal.