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The FARA 2 meter amplifier project circuit

This article discusses a 2-meter amplifier capable of delivering an output of 25-30 watts. Over 35 units have been acquired at a cost of less than $50 each in bulk. Photo A displays the final version of the circuit board,...

Op-Amp Application: Level Shifting Amplifier

In linear equipment design, it is sometimes necessary to take a voltage that is referenced to a certain DC level and generate an amplified output that is also referenced. In linear circuit design, the process of amplifying a voltage that is...

capacitor values for non inverting op amp circuit

All the capacitors are present to block DC signals; however, the values of capacitance are crucial, and it is necessary to determine the value of Co. Rin denotes the source resistance, which is not an integral part of the amplifier...

Mooring Light Controller

Integrated-circuit U1-an LF351 or 741 op amp-is used as a comparator to control the light. Resistors R2 and R3 provide a reference voltage of about 2.5 volts at pin 3 of U1. When daylight falls on light-dependent resistor LDR1, its...

Refrigerator Pig

Upon opening your fridge door the photocell is exposed to light and the piggy oinks. Reverse engineered circuit diagram is of an early commercial design which uses an OP-AMP to make simulated pig sounds. Modern Fridge Pigs sound much better...

Voltage Controlled Voltage Source

The drawback of the circuit mentioned is that the operational amplifier (op-amp) supply is connected to the high voltage (HV) supply. Most op-amps are limited to approximately 30V for their supply voltage, which prevents the circuit from functioning with higher...

Signal Meter circuit

The operational amplifier (op-amp) used in the signal meter circuit is the TL061. The LF351 can also be used interchangeably, as it has the same pin layout. For those using a TL062 or similar models, the differing pin configurations are...

Inverting-sample-and-hold

This illustrates another application in which the hookup versatility of a sample-and-hold often eliminates the need for a separate operational amplifier and a sample-and-hold module. This hookup will have a somewhat higher input-to-output feedthrough during hold than the non-inverting connection,...

op amp Why the resistor in this op-amp circuit

Here is a circuit diagram for a signal response test circuit from the specification sheet for a HA-5195 operational amplifier. It appears to be a non-inverting amplifier circuit with a gain of 5, along with a 200-ohm resistor connecting Vout...