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Transistor Checker Circuit – Circuit Schematic
Transistor Checker Circuit
The circuit is built around a 741 general-purpose op amp that is configured as a voltage follower; with the components shown, the op amp has a voltage gain of ...
Second-Order Polynomial Generator Circuit – Circuit Schematic
Second-Order Polynomial Generator Circuit
By using a circuit built with a single analog multiplier and five precision resistors, an output voltage (Ko) can be made to create a second- order polynomial....
Audio-To-Adc Interface Circuit – Circuit Schematic
Audio-To-Adc Interface Circuit
This simple general-purpose driver for an analog/digital converter uses two 741 IC devices with adjustable gain and offset, Other op amps might be substituted,...
Current-Driven Sallen Key Filter Circuit – Circuit Schematic
Current-Driven Sallen Key Filter Circuit
The low-pass Sallen-Key filter is staple for designers because it contains few components (A). By redesigning the filter,...
Simple Low-Pass (Lp) Active Filter For 1Khz Circuit – Circuit Schematic
Simple Low-Pass (Lp) Active Filter For 1Khz Circuit
This simple filter uses an RC section for a filter element, with a voltage follower for other frequencies /3 dB = 1/6.28 RXCV Response...
Simple High-Pass (Hp) Active Filter For 1Khz Circuit – Circuit Schematic
Simple High-Pass (Hp) Active Filter For 1Khz Circuit
This simple 1 kHz filter uses a voltage follower and an RC section for a.filtcr element....
Active Fourth-Order High-Pass Filter For 50Hz Circuit – Circuit Schematic
Active Fourth-Order High-Pass Filter For 50Hz Circuit
This circuit which uses an LM1458 or similar op amp is a fourth-order high-pass filter with a 24 dB/octave roll-off....
5-Pole Low-Pass Filter Circuit – Circuit Schematic
5-Pole Low-Pass Filter Circuit
The LTC1063 is the first monolithic low-pass filter that simultaneously offers outstanding dc and ac performance. It features internal or external clock tunabi...
Variable High-Pass Filter Circuit – Circuit Schematic
Variable High-Pass Filter Circuit
This second order filter which should prove useful in audio applications uses an LM1458 or other similar of op amp. It is tuneable from 30 to 300 Hz cutoff....
Variable Low-Pass Filter Circuit – Circuit Schematic
Variable Low-Pass Filter Circuit
This second-order low-pass filter uses a 741 op amp and is tuneable from 2.5 kHz to 25 kHz. This circuit is useful in audio and tone control applications....
Variable-Frequency Audio Bp Filter Circuit – Circuit Schematic
Variable-Frequency Audio Bp Filter Circuit
This variable-frequency, audio bandpass filter is built around two 741 op amps that are connected in cascade. Two 741 op amps are configured as identical RC ac...
Active Second-Order Bandpass Filter Circuit – Circuit Schematic
Active Second-Order Bandpass Filter Circuit
This filter circuit which uses LM1458 or similar op amp has a response of 300 Hz to 3.4 kHz with 12 dB/octavc roll-off outside the pass band. Sqction A is the ...
Active Fourth-Order Low-Pass Filter Circuit – Circuit Schematic
Active Fourth-Order Low-Pass Filter Circuit
This circuit is a fourth-order low-pass filter with values for kHz. The values of Rv R2, C and C2, and R3, R4, C3 and C`4 can be scaled for operation at other ...
Four-Output Filter Circuit – Circuit Schematic
Four-Output Filter Circuit
The classic state-variable (two-integrator) filter (see Fig. A) is famous for its insensitivity to device parameter tolerances, as well as its ability to provi...
Active Low-Pass Rc Filter Circuit – Circuit Schematic
Active Low-Pass Rc Filter Circuit
The circuit shown has a cutoff frequency at about 1 kHz. Rl, R2, CI, and C2 can be scaled to change this...
Large Lcd Display Buffering Driver Circuit – Circuit Schematic
Large Lcd Display Buffering Driver Circuit
Large LCD devices of 1 or more exhibit a large driving capacitance to the driver circuits. To solve this problem, the drive circuit shown (see the figure) intr...
Closed-Loop Peak Detector Circuit – Circuit Schematic
Closed-Loop Peak Detector Circuit
This closed-loop peak detector circuit uses a Schottky diode inside feedback loop to obtain good accuracy. The 20- resistance RQ isolates the 0.01- load and pr...
Open-Loop Peak Detector Circuit – Circuit Schematic
Open-Loop Peak Detector Circuit
In this open-loop design, the detector diode is Dl, and a level shifting or compensating diode is D2. Load resistor RL is connected to -5 V, and an identical b...
Offset-Adjusting Current Source Circuit – Circuit Schematic
Offset-Adjusting Current Source Circuit
Though this setup can act as a cost-effective current source with an output accurate to 1%, the voltage offset will turn on the current source even when Vqq eq...
Protected Intrinsically Safe Op Amp Circuit – Circuit Schematic
Protected Intrinsically Safe Op Amp Circuit
The circuit is designed to drive an external load. A fault condition in the external load circuit could feed excessive current or voltage back into the line dr...