DE1449345C

DE1449345C - Device for recording impulses on magnetic carriers

Info

Publication number: DE1449345C
Application number: DE19631449345
Authority: DE
Inventors: Manfred 6232 Bad Soden; Weinig Helmut 8520 Erlangen Selzer
Original assignee: Triumph Werke Nürnberg AG, 8500 Nürnberg
Priority date: 1963-07-05
Filing date: 1963-07-05
Publication date: 1973-03-15

Description

Um bei geschlossenem Schalter 12 einen Strom Il von entgegengesetzter Richtung, in F i g. 1 durch den gestrichelten Pfeil dargestellt, durch die Wicklung des Magnetkopfes fließen zu lassen, muß an der Spannungsquelle 5 eine Spannung U₂ — Il (2 Rl + K) + U₁ vorhanden sein.In order to generate a current II from the opposite direction when the switch 12 is closed, in FIG. 1 shown by the dashed arrow, to flow through the winding of the magnetic head, a voltage U ₂ - II (2 Rl + K) + U ₁ must be present at the voltage source 5.

Um nun für beide Fälle eine gleiche Zeitkonstante τ = L/R zu erhalten, ist der Widerstand 8 durch die Diode 13 in der Weise überbrückt, daß bei geöffnetem Schalter 12 der Widerstand 8 kurzgeschlossen und bei geschlossenem Schalter 12 die Diode 13 nicht leitend ist. Der Innenwiderstand der Diode ist dabei sehr klein gegnüber dem Widerstand 8.In order to obtain the same time constant τ = L / R for both cases, the resistor 8 is bridged by the diode 13 in such a way that when the switch 12 is open, the resistor 8 is short-circuited and when the switch 12 is closed, the diode 13 is not conductive. The internal resistance of the diode is very small compared to resistor 8.

F i g. 2 zeigt ein Ausführungsbeispiel, bei dem in einer gemeinsamen Schaltung ein Magnetkopf 2ψ für die Aufzeichnung einer Taktspur und ein Magnetkopf 2z für die Aufzeichnung einer Ziffernspur angeordnet sind. Als Schaltelemente zur Steuerung der beiden Magnetköpfe dienen Transistoren 14 und 15. Die Widerstände 16, 17 und 18, 19 entsprechen den Widerständen 10, 11 der F i g. 1. An Stelle der Spannungsquellen 5 und 6 sind niederohmige Widerstände 20 und 21 vorgesehen, die am Minuspotential liegen und als Spannungsteiler wirken. Die Steuerung der Schaltung erfolgt an den Transistoren 14 und 15 durch Aussteuerung derselben. Der Stromfluß in den einzelnen Schleifen entspricht dem in F i g. 1. Zur Vereinfachung der Schaltung ist der mit der .Magnetkopfwicklung in Reihe liegende Widerstand sowie die ihn überbrückende Diode weggelassen. Um gleiche Zeitkonstanten zu erhalten, werden sie aber zweckmäßig in dem Zweig des Magnetkopfes entsprechend der F i g. 1 mit der Wicklung des Magnetkopfes in Reihe geschaltet.F i g. 2 shows an embodiment in which a magnetic head 2ψ for recording a clock track and a magnetic head 2z for recording a digit track are arranged in a common circuit. Transistors 14 and 15 serve as switching elements for controlling the two magnetic heads. Resistors 16, 17 and 18, 19 correspond to resistors 10, 11 in FIG. 1. Instead of the voltage sources 5 and 6, low-resistance resistors 20 and 21 are provided, which are at negative potential and act as a voltage divider. The circuit is controlled on transistors 14 and 15 by modulating the same. The current flow in the individual loops corresponds to that in FIG. 1. To simplify the circuit, the resistor in series with the magnetic head winding and the diode that bridges it have been omitted. In order to obtain the same time constants, however, they are expediently in the branch of the magnetic head according to FIG. 1 connected in series with the winding of the magnetic head.

Hierzu 1 Blatt Zeichnungen1 sheet of drawings

Claims

I 449 345 1 2 Current through the magnetic head in both directions Patent claims: to let flow. Accordingly, in a device for up-

1. Device for recording pulses with drawing pulses on magnetic carriers on magnetic carriers with a magnetic head, 5 a magnetic head, the winding of which with an in whose winding is subjected to a current flowing in both directions flowing current is applied, characterized according to the invention, the winding of the magnet, that the winding (1) of the head between the connecting line of two rear magnetic heads (2) between the connection line of resistors connected one behind the other and the connection of two resistors connected in series (10, io line of two voltage-11 connected in series) and the connecting line (4) of two rear sources arranged in such a way that one of the interconnected Voltage sources (5, 6) resistors and each one of the voltage sources is arranged in such a way that one of the resistances of the winding of the magnetic head forms a circuit, (10, 11) and one of the voltage sources (5, 6) each with a switch in one of the two circuits with the winding (1) of the magnetic head (2) a 15 is arranged such that when the switch is open Form a circuit, with one of the two current current in one direction and when closed circles a switch (12) is arranged in such a way that the switch flows in the other direction through the load, When the switch is open, the current in one of the known devices has the Direction and with the switch closed in the device according to the invention has the advantage that flows through the load in the other direction. 20 the circuit structure is very simple because it is with

2. Device according to claim 1, characterized in that a single switching transistor, the switchover indicates that in series with the winding (1) is possible.

of the magnetic head (2) a resistor (8) is connected. In a further development of the invention, it is useful to

is bridged by a diode (13), in series with the winding of the magnetic head one to switch their internal resistance very low compared to the resistance that is crossed by a "diode"

of the bridged resistor (8). is bridged, the internal resistance of which is very small compared to

3. Device according to claim 1 or 2, characterized in that it is above the bridged resistor. Through this characterized in that as a switch, a switching transient is achieved that when opening and when closing sistor (14 or 15) is provided. the same time con-

4. Device according to claim 1 or the 30 stanten are available.

The following, characterized in that the invention is based on the following voltage sources low-resistance resistors (20, 21) description and the drawing of execution provided, which are explained using a common examples. It shows
Voltage source. F i g. 1 a general circuit diagram and

5. Device according to claim 1 or 35 F i g. Fig. 2 shows an embodiment for the recording following, characterized in that when ver a clock and a digit track.

application of two magnetic heads (2r, 2z), for In F i g. 1 is with 1 the winding of the magnetic head 2

Example for recording a clock and one marked with one end 3 with the Ver-digit track, the circuits for the magnetic head connection line 4 from two voltage sources 5 and 6 windings via common voltage sources 40 is connected. The other end 7 of the magnetic head (20, 21) are interconnected. winding 1 is via a resistor 8 with the Ver

connecting line 9 of two resistors 10 and 11 connected. . .

The resistor 11 forms with the voltage source 6,

45 the resistor 8 and the magnetic head winding 1 form a closed loop, during the re-die The invention relates to a device for stand 10, the voltage source 5 with the redrawing of pulses on magnetic carriers with stand 8 and the magnetic head winding 1 another a magnetic head whose winding forms with a loop, the resistor 8 and the current flowing in both directions is applied. 50 Magnetic head winding 1 common to both loops A device of the type mentioned is in the.

German Auslegeschrift 1 072 819 described. The distance between the resistor 10 and the voltage

To reduce the noise level in the recording source 5, a switching element 12 is arranged. the of audio frequencies is by using a resistor 8 is bridged by a diode 13, Bridge circuit reached. The resistances at 55 are their internal resistance compared to resistance 8 this arrangement so adapted to one another that it is very small. The cons are expediently direct current components for the speaking head as small as possible, 10 and 11 would be the same size, and the size of the will. Resistance 8 is half of one of the resistance

In other known arrangements, stands 10 or 11.

Recording of pulses a magnetic head with two 60 The function of the arrangement is as follows:
Switching transistors connected, which control the flow of current in the switch 12 is open, in F'i g. 1 dashed

the one or the other direction corresponding to the one shown, then a current II flows, determined by binary information through the winding of the magnet- the voltage of the voltage source 6, in which the head allows. Direction indicated by the arrow through the winding 1 of the

The invention has for its object a 65 magnetic head. The voltage at the voltage device for recording pulses on source 6 is U ₁ = (Rl + R) Il, where Rl is the same as the magnetic carrier to create, in which only the resistance of the magnetic head winding and R is a single switching element required to that of the resistor 11 is.