SU805479A1 - Controllable pulse generator - Google Patents

Description

(54) CONTROLLED PULSE GENERATOR

the first and second output LEDs, which are connected to odd and even bits, respectively.

The drawing shows a circuit diagram of the device.

The generator contains an input LED 1, bits 2–5 of the oppositely connected LEDs b and photodiode 7, the source of the 8 clock square wave, the source of the initial impulse 9. LED b of each is associated with a photodiode 7 of its own and a trace of a $ 10 ave. The bits 2 and 4. are connected to the source 8 through the resistor 10 with the same polarity, and the bits 3 and 5 are connected to the source 8 through the resistor 10 with the other polarity. Element 11 is connected by the first input to the output of the source 9, the second input through the inverter 12 to the cathode of the output photodiode 13, the anode of which is connected to the negative pole of the current source 14, and the third input to the pole of the source 8, the other pole of which is connected to the cathode of the output LED 15 and the anode of the output LED 16. Regularly closed keys 17 - 19 are introduced into the discharge. LEDs 15 and 16 optical ki associated with photodiode 13 and connected to the odd and even bits of the respectively. Diodes 20 and 21 protect the LEDs 15 and 16 from being broken by reverse voltage.

Managed his pulse generator operates as follows.

In the initial state at the output of the generator, and consequently, at the input of the inverter 12, the signal is absent, which corresponds to the presence of a signal at the output of the inverter 12 and at the second input of the element And, 11. Therefore, when a negative trigger pulse is applied to the first input of the element 11 during the existence of a negative potential from the source 8 at the third input of the element 11, the latter opens, which leads to the excitation of the led 1 and an increase in -. When the polarity of the clock square wave changes, the optical flux of the LED 1 decreases and the optical flux of the light diode rises; (p-1 da 2. Since the photodiode 7 of the discharge 2 performs optical summation of the two fluxes, this photodiode will be excited during the entire period of the clock square wave.

A photodiode 7 bit 3 also monitors changes in the optical flux of its own and previous LEDs 6.

Since the polarity of connection of bits 2 - 5 alternates, when the first bit is triggered and if there is a clock square wave at the output of the source 8, the optical flow will move in bits with the rate of change of the polarity of the clock square wave. At the same time through the LEDs 15 and 16 alternately current flows, and their optical fluxes excite the photodiode 13 connected to the output of the generator.

When, for example, the key 18 is opened, the optical flow passes through bits 2 and 3, and at discharge 4 it fades out. As a result, the output photodiode 13 will be excited during the meander period.

When the next key 19 is opened, the photodiode 13 will be excited for three half periods of the clock square wave.

The duration of a pulse depending on the n-number of the open key can be determined by the formula

and i-.

where T is the period of the clock meander.

Claims (2)

Claims of the invention A controlled pulse generator comprising odd and even bits from opposite-connected LEDs and a photodiode, a clock square source, a trigger source, a pulse source, a current source and resistors, each LED being associated with its own photodiode and the next bit, the odd bits are connected to the clock square source through the first resistor of one polarity, and the even bits are connected to the clock square wave source through the first resistor by the other polarity that distinguishes so that, in order to simplify control, it contains an AND element, an inverter, an input LED that is connected through a second resistor to the output of the AND element and is optically coupled to the first discharge photodiode; the output photodiode connected by the anode to the negative pole of the current source, and the cathode to the inverter input, two output LEDs connected in series and in accordance with the diodes, and normally closed keys are inserted into the bits, the AND element connected by the first input to the output source of the trigger pulse, the second input to the output of the inverter, and the third input to the source pole of the clock square wave, the other pole of which is connected to the cathode of the first output LED and the anode of the second output LED, and the output photodiode is optical cally coupled to first and second output LEDs, are connected to the odd and even bits of the respectively Sources of information taken into account in the examination 1, SV Svechnikov. Elements of optoelectronics. Soviet Radio, 1971 p. 224. 2. Japanese Patent No. 48-33545, cl. 98 (5) C 23, published. 1973.