DE1083323B - Light-controlled bistable multivibrator with two transistors - Google Patents

Description

GERMAN

Bistable multivibrators are known. With them, the switching from one transistor T ₁ (Fig. 1) to another transistor T _{2 takes place} in that a negative potential is applied to point A when the transistor T _{1 is conductive.} Then T _{1 is} blocked and T _{2 is} conductive. This state is maintained until a positive potential occurs at A , whereupon T ₁ becomes conductive and T ₂ non-conductive.

This arrangement can be used, for. B. apply when a certain potential is caused Control process should be maintained until a potential with opposite polarity is applied the bistable multivibrator is placed. Such facilities find z. B. with setpoint control in Measuring instruments application.

In this case, the potential change at the input of the multivibrator is generated, for example, by inductive, capacitive or photoelectric effects. Such facilities therefore need in addition to Multivibrator another scanning arrangement.

The effort required for such arrangements is significantly reduced according to the invention and simplified that a bistable, working with two transistors arranged next to one another Multivibrator is used and that the two transistors of this multivibrator are used simultaneously photoelectric switching elements act. The control is done by a cover flap between a Light source on the one hand and the two transistors on the other hand passes through it.

The arrangement is explained in more detail with reference to FIGS. 1 and 2.

Fig. 1 shows the circuit diagram of a normal bistable multivibrator in which T ₁ and T _{2 represent} the two transistors whose protective lacquer coating has been removed. In Fig. 2, L is the lighting lamp and F is a cover flap moving between the lighting lamp and the transistors.

The flag F is to the left of the two transistors T ₁ and T ₂ (Fig. 2). T ₁ is blocked and T _{2 is} conductive. If the flag moves in front of T ₁ , it is blocked even more. When moving the flag to the right, both transistors are covered and T ₁ is still blocked. If the flag moves further to the right, T ₁ is illuminated again while T ₂ remains darkened. Now there is a potential shift in such a way that T _{1 is} conductive and T _{2 is} blocked. If the flag moves even further to the right, so that T ₁ and T _{2 are} illuminated again. Light-controlled bistable multivibrator with two transistors

Applicant:

Ultrakust Gerätebau, Dr.-Ing. O. Raudszus, Ruhmannsfelden (Ndb.)

Dr.-Ing. Oswald Raudszus, Ruhmannsfelden (Ndb.), Has been named as the inventor

are, then T ₁ remains conductive. When the flag recedes, the process takes place in the opposite direction. At the moment when T _{2 is} illuminated and T _{1 is} covered, T ₁ is blocked again and T _{2 is} conductive.

If a switching relay is placed in the circuit for T ₂ , it must be ensured that if the supply voltage fails and the lamp burns out, T _{2 is} de-energized. The latter is achieved according to the invention in that the lamp L is placed as resistor R ₂ in the voltage divider for the base bias of T ₁ . If the lamp burns out, T ₁ becomes conductive and the _{relay in the T 2} circuit drops out.

Claims (2)

PATENT APPLICATIONS: 1. Light-controlled bistable multivibrator with two transistors, characterized in that between the juxtaposed transistors acting as photoelectric switching elements of the multivibrator and a light source, a cover flag runs through it, so that when Passing the flag in one direction of the one operating state of the multivibrator and when Passing the flag in the opposite direction, the other operating state occurs. 2. Light-controlled bistable multivibrator according to claim 1, characterized in that the lighting lamp for the transistors as a resistor in the base voltage divider of the first transistor is switched so that when the lamp burns out, the first transistor becomes conductive. Documents considered: German Patent No. 1 044 165. 1 sheet of drawings