This circuit may be best choice. I interested circuit. It is cheap Logic probe using Which is the integrated circuit of not gate buffer logic.
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This circuit may be best choice. I interested circuit. It is cheap Logic probe using Which is the integrated circuit of not gate buffer logic. Look at the circuit. Look at the circuit We use the integrated circuit LM as key circuit. They drive All LED display. It requires very low current of about 10mA.
There is potentiometer to adjust a gain of 3 level logic digital. As follows. The green LED is high level logic. The red LED is low level logic. Circuit 3 Mini Logic probe with transistor circuit If you are looking for a simple transistor logic probe circuit.
This may be one good chioce. It is suitable for checking the voltage levels in the TTL circuit. There 2 LED displays to shows high and low logic level. When the input voltage to the probe tip is higher than 2. And the collector voltage of Q1 is low voltage. So, Q2 does not work. Because base-emitter of transistor Q2 is low status. And LED2 does not glow up, too. If the input voltage changed to 0 volts low level logic. Then Q1 is not the current bias is not working. Then, the current flows through R2 to base of Q2.
So, it runs. Why it special than other circuit? So, clearly display text, easy to see the value. Since, it requires 5V power supply. Operation of the circuit Look at the circuit below. In normal state, the input is Low. And IC1 which is nand gate into not gate. Then, the ouput of IC1 is high status.
And Q1 works with voltage drops across R2. Then, the high voltage comes to the diodes D1, D2, D3. In contrast, if the input is high voltage. So, the Q1 does not work. And the circuit will have a resistor R7 is connected too. To help reduce the current flow to the LED 7 Segment. It will protect any damage. It is not worry. I apply to this circuit is very simple and cheap as well. Is it good?
If we use tones as a result high or low status instead. Look at the circuit It uses a few parts. So cheap and easy. We use a tiny speaker to emit different tone sound rate fast and slow. The two-transistor in circuit No. BC and BC They are a simple astable Multi vibrator. The tone or frequency can determines by a kohm resistor and 10 uF capacitor.
And, the speaker serves as a load of Q3 transistor BC The current flows from emitter- collector and SP1 to ground negative. BC transistor and a resistance of 10K in parallel with a resistor K. They will detect a level of voltage. If it is a high state high BC will work. And the repetition rate increases. It control a high frequency on output.
In controling LED display. In case of still have no input signal comes. It makes a lot of impedance. Which it no LED light up. It makes LED1 go out. But LED2 light up. It makes LED1 light up. But LED2 goes out. To drive the current for LED3 and it flashes. In third case, if input is pulse. It will be both Low and High status alternately. And LED3 will light up at all time. Conclusion These circuits are interesting concepts.
Hope that friends can use it. Some circuits I have never actually tried. Therefore there may be a mistake. If you try and get any results. Please share with us. Here are a couple of related articles you should read, too:.
Folklore CD4001 York Wallpaper
It has small notch on one side which is identified as pin 1. It consists of 4 independent NOR gate in a single chip. Each gate has 2 inputs and 1 output. Working voltage range of IC is from 5V to 15V. It can deliver approx. IC consists of 14 pin where pin numbers 7 and 14 are connected to battery or DC power supply.
Understanding NOR Gate (CD4001)