JPS62237788A - Input level setting circuit for regulating electronic circuit - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention is applicable to many transistors, diodes, resistors,
In electronic circuits composed of components such as debt collection circuits,
The present invention relates to an adjustment input level setting circuit for an electronic circuit in which the levels of a plurality of adjustment input terminals are set by appropriately cutting a pattern to perform circuit compensation.

[Conventional technology]

FIG. 2 shows a conventional input level setting circuit for adjusting this type of electronic circuit. The electronic circuit main body provided in the electronic circuit body, 3 to 6 are inverters that invert and output input signals, and the inputs of the inverters 3 to 6 are connected to a positive voltage power supply 16 via resistors 7 to 10, and are connected to an EPROM, etc. It is also connected to memory 1 of .

If an "L" level signal does not enter from this memory l, the output of the positive voltage power supply 16 is used to invert the inverters 3 to 3.
Adjustment input terminals 12 to 6 of this electronic circuit, which are also inputs of
15 is fixed at a predetermined positive potential.

When it is desired to fix the input levels of the adjustment inputs 12 to 15 in the electronic circuit 2 to "H" (high level) or "L" (low level), for example, inputs 13 and 15 are set to "L", and input 12 and 15 are set to "L". 14 and 13 of outputs 12 to 15 of EPROM1.
Set the write input data of the EPROM so that
The data was written to M and used.

[Problem that the invention seeks to solve]

Conventional electronic circuit adjustment input level setting circuits are configured as described above, so if one or more of the components making up the circuit varies from the specified value, the adjustment inputs 12 to 12.
In order to correct the 15 data, it was necessary to rewrite the contents of the EPROM, and a ROM writer was used to store new data in the EPROM.

This invention was made to solve the problems of the conventional ones as described above, and provides an input level setting circuit for adjusting electronic circuits that can compensate for variations in circuit components without using expensive EFROM. is intended to provide.

[Means for solving problems]

In the electronic circuit adjustment input level setting circuit according to the present invention, a wiring pattern for fixing the electronic circuit adjustment input to either high or low level is run in a portion corresponding to the EPROM, and this pattern is It is constructed so that it can be cut using a laser cutter or the like to form a circuit equivalent to the function of an EPROM.

[Effect]

In this invention, the wiring pattern is constructed so as to be equivalent to fixing the contents of the EPROM to ground potential (or "H" level).
By cutting only the pattern that requires "level" (or a L II level), the adjustment input can be fixed at either "H" or "L" level, and the EPRO
M becomes unnecessary.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. 1st
The figure shows an input level setting circuit for adjusting an electronic circuit according to an embodiment of the present invention.
The parts other than 2 are the same as in Fig. 2. 17 is the ground terminal,
19 to 22 are wiring patterns for fixing the human power for adjusting the electronic circuits 12 to 15 to the ground potential, which are also the inputs of the inverters 12 to 15. On the 1st, if necessary, cut the pattern with a laser cutter to connect the terminals 12 to 15. This is a part of the wiring patterns 19 to 22 for setting the potential to "H" or "L", and the width is narrower than other parts of the wiring patterns 19 to 22 so that laser cutting is easy. It is formed like this.

Next, the operation will be explained. In the circuit shown in Figure 1, terminal 12.14 is set to "H" level, and terminal 13.15 is set to "L" level.
If you want to set the respective levels, since the terminals 13.15 are connected to the ground terminal 17 via the portions 18 of the wiring patterns 19 to 22, the terminals 13.15 can be set to the same level by not cutting the portions 18. is “L”
” level. On the other hand, terminals 12 and 14 are set to “H” level.
Since it is necessary to fix it at the level, by cutting the portion 18 in the wiring pattern, the “H” level is applied via the resistor 8.10.
Potential is fixed.

Therefore, EPR can be written using a ROM writer like the conventional one.
There is no need to rewrite the OM, and electronic circuit interpolation can be easily performed by simply laser cutting only the necessary terminals.

In the above embodiment, the input level setting circuit is an EPROM.
Although we have described the case where the input level setting circuit part is composed of logic circuits, it can also be applied to a case where the input level setting circuit part is made up of a logic circuit, and has a wide range of uses.

〔Effect of the invention〕

As described above, according to the input level setting circuit for adjusting an electronic circuit according to the present invention, the input level for adjusting an electronic circuit can be set by cutting a pattern on a board without using an expensive device such as an EPROM. By doing so, we were able to achieve a significant reduction in cost and size compared to conventional products.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an input level setting circuit for adjusting an electronic circuit according to an embodiment of the present invention, and FIG. 2 is a diagram showing an example of a circuit constructed using a conventional technique. In the figure, 2 is an electronic circuit, 11 is an electronic circuit main body, and 3 to
6 is an inverter, 7-10 are resistors, 18 is a part to be laser cut if necessary, 17 is a ground terminal, 19-2
2 is a wiring pattern, and 16 is a positive voltage power supply. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Claims] (1) A circuit for setting the adjustment input of an electronic circuit to a required binary level when one or more components in an electronic circuit composed of multiple electronic components fluctuates from a specified value. , a wiring pattern is provided on the electronic circuit board for fixing the adjustment input to either high or low level, and changing the adjustment input to the other level is possible using the wiring pattern on the electronic circuit board. An input level setting circuit for adjusting an electronic circuit, characterized in that the adjustment is performed by cutting a wiring pattern.