Mini-electronic blinking compartment

Claim 1

An alternating blinking display device having a housing means and a message area thereon comprising: a voltage source, first and second indicator means, and main operating circuit means including; first and second switching transistors of the same type, said first indicator means serially coupled to the collector of said first switching transistor forming a first series circuit branch, said second indicator means serially connected to the emitter of said second switching transistor forming a second series circuit branch, said first and second series circuit branches each connected directly across said voltage source, the base of said second switching transistor coupled to the collector of said first switching transistor, a control transistor of a type complementary to said switching transistors also connected in parallel circuit arrangement across said voltage source, the collector of said control transistor coupled to the base of said first switching transistor, potentiometer means independent of said first and second switching transistors, interconnecting the base of said control transistor with said voltage source for biasing said control transistors, and a regenerative feedback circuit including in series circuit arrangement, resistor means and capacitor means, said feedback circuit coupled between the base of said control transistor and the collector of said first switching transistor whereby said indicator means are alternatingly operative.