SU505121A1 - Current pulse shaping device for electrochemical recording - Google Patents

Description

one

The invention relates to a pulse technique and can be used in forming output stages of multielectrode recording nodes with parallel recording of decomposition line elements.

A current pulse shaping device for electrochemical recording based on a blocking transistor with a collector-base positive feedback is known, containing a diode, a load in the emitter circuit of the transistor, and the base winding of the positive feedback is connected in parallel with the emitter-base transition of the transistor.

However, the use of a known device leads to severe wear of the recording electrode due to the presence of a positive voltage on the recording electrode from the bias source.

The purpose of the invention is to increase the service life of the recording electrode.

For this, in the proposed device, parallel to the emitter-base junction of the transistor, a resistor and a circuit of a series-connected diode and a winding of the input transformer are additionally included.

The drawing is a schematic diagram of the proposed current pulse shaping device for electrochemical recording.

The device consists of a blocking generator on transistor 1 with a collector-base positive feedback. Parallel to the emitter-to-base transistor 1 included

the resistor 2, the base winding 3 of the transformer 4 is a positive reverse collector-base communication and a circuit of diode 5 connected in series and the secondary winding 6 of the input transformer 7. The primary winding 8

the input transformer 7 is connected via diode 9 to the input terminals 10. The collector of transistor 1 is connected via series-connected collector winding I of the transformer 4 positive reverse collector connection and the resistor 12 is connected to the negative terminal 13 of the power supply. A load 15 is inserted between the emitter of transistor 1 and the total length 14, which is the electrical resistance of the electrochemical paper 16 connected between the recording 17 and the common 18 electrodes.

A current pulse shaping device for electrochemical recording operates as follows.

The device is started through the primary winding 8 from the input terminals 10. In the secondary winding 6 of the input transformer 7, a negative pulse is induced, which through diode 5 enters the base of transistor 1. When

when the threshold of operation of the blocking generator on the transistor 1 with the collector-base positive feedback is realized through the transformer 4, it begins to generate an impulse whose parameters depend on the parameters of the circuit element. During the formation of this pulse, the diode 5 is closed by a reverse voltage arising between the emitter and the base of the transistor 1.

The waiting mode of the transistor 1, during which it is curled, is achieved by selecting the appropriate resistor 2 nominal value without using a secondary source of blocking voltage, which increases the service life of the recording electrode, since there is no constant positive potential on it.

The inclusion of an input transformer 7 with diodes 5 and 9 eliminates the influence of the formation circuit of the input recording pulse on the input circuit.

Claims (1)

Invention Formula A current pulse shaping device for electrochemical recording based on a blocking generator on a transistor with a collector-base positive feedback, containing a diode, a load in the emitter circuit transistor, the base winding of the positive feedback is connected parallel to the emitter-base junction of the transistor, characterized in that, in order to increase the life of the recording electrode, parallel to the emitter-base junction of the transistor, a resistor and circuit from the series-connected diode and the winding of the input transformer are included.