Operational Amplifier OP AMP Tester For Single Dual opamp TL071 TL072 TL081/082
Application:
Single op amp and dual op amp screening circuit board, the circuit board can judge whether the IC can be used for amplification, and can roughly judge the conversion rate of the chip at the same time. Can find out those low-speed chips that pretend to be high-speed chips.
Working Voltage: DC 12V
Working Current: Above 100mA
IC1a in the circuit is connected to a multivibrator with a frequency of about 1Hz, and the OP Amp. to be tested is connected to a unity gain inverting amplifier working state.
IC2 is an EX-OR gate, and its truth table is that the output is 1 when the two inputs are inverted.
Therefore:
If OP Amp. is normal, points A and B of IC2 must be reversed, so C is 1, and it is still 1 after IC1b and 1d, so the yellow LED D3 lights up;
If the OP Amp. output is open, the point C of IC2 must always be 0, and it becomes 1 after IC1c, so that the red LED D4 lights up.
If the internal short circuit of OP Amp. makes the output voltage fixed to positive or negative, the output of IC1c is also a 1Hz low frequency square wave, and the red and yellow LEDs will flash alternately.
For chips with a low conversion rate, the status indicated by the LED is always yellow, and red will flicker faintly. This can also be used to roughly judge the conversion rate of the chip. Because most of the second-hand chips on the market use low conversion rate instead of high rate, it can also judge whether the chip is counterfeit or not.
The actual test of low conversion rate chips such as: OP07, LM741, the yellow light is always on, the red light is slightly bright.
The actual test of high conversion rate chips such as: TL071, NE5534, MC34071 and other chips, the yellow light is always on, the red light is off.
Single op amp model: LM741, LF356, NE5534, TL071, TL081, OP07 and other standard package single op amp.
Dual op amp model: LM358, NE5532, TL072, TL082, MC1458, RC4558, OP275, AD827 and other standard package dual op amps.
1pcs x Operational Amplifier Tester
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