• Year
  • 1959 ??
  • Category
  • Service- or Lab Equipment
  • Radiomuseum.org ID
  • 111885

 Technical Specifications

  • Wave bands
  • - without
  • Power type and voltage
  • Dry Batteries / 1,5 Volt
  • Material
  • Various materials
  • from Radiomuseum.org
  • Model: Mosquito Signal Tracer - Don Bosco Electronics Inc.;
  • Shape
  • Miscellaneous shapes - described under notes.
  • Notes
  • Pen style signal tracer for servicing transistor radios.
  • Source of data
  • -- Collector info (Sammler)
  • Author
  • Model page created by a member from A. See "Data change" for further contributors.

 Collections | Museums | Literature


Forum contributions about this model: Don Bosco: Mosquito Signal Tracer

Threads: 2 | Posts: 2

My example was not functioning and I decided to dismantle the probe to understand its function and design.

The dismantle process can only be done in a destructive manner but yielded useful information as follows:

The device is essentially composed of a non blocking oscillator comprising only a pulse transformer with two windings, a PNP transistor (2N408) and a capacitor of value around 500pf.  The precise value was not readable as the capacitor appears to have been damaged (probably by connection to a high voltage equipment under test).

The circuit appears very similar to the Eico injector of a similar vintage (details on antiqueradios.com).


David Sanderson, 27.May.18

Weitere Posts (1) zu diesem Thema.

I have an example of this Dom Bosco signal injector.

Further information about the device is available on the a web site run by Steve Johnson.




David Sanderson, 27.May.18

Weitere Posts (1) zu diesem Thema.