• Country
• United States of America (USA)

• Manufacturer / Brand
• Gessy Electronics - GSC; (where?)

• Year
• 1978 ??

• Category
• Power supply/conditioner or battery or charger 

• Radiomuseum.org ID
• 336161

Click on the schematic thumbnail to request the schematic as a free document.

• Number of Transistors
• 3

• Semiconductors
• ECG249 2N3055 2N3055

• Wave bands
• - without

• Power type and voltage
• Alternating Current supply (AC) / 120 Volt

• Loudspeaker
• - - No sound reproduction output.

• Material
• Metal case

• from Radiomuseum.org
• Model: 12VDC Regulated DC Power Supply 20R - Gessy Electronics - GSC; where

• Shape
• Tablemodel without push buttons, Mantel/Midget/Compact up to 14

• Dimensions (WHD)
• 11 x 9.75 x 4 inch / 279 x 248 x 102 mm

• Notes

• The GSC 20R is a regulated power supply using a zener controlled ECG249 Darlington NPN as an intermediate transistor feeding the bases of two parallel 2N3055 pass transistors.  All three transistors are in TO-3 metal cases.  Although marked at 20 amperes, that rating should be interpreted for intermittent (ICAS) use only.

  When compared to power supplies such as Astron, the circuit is minimalist  with no overvoltage protection or RF protection capacitors and uses fewer pass transistors for the current rating.  The fuse is wired for output, not input.

• Literature/Schematics (1)
• KB8TAD self-drawn schematic from original device

• Author
• Model page created by Rich Post. See "Data change" for further contributors.

• Other Models

• Here you find 1 models, 1 with images and 1 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Gessy Electronics - GSC; (where?)