Microphone Circuit Test Oscillator
The described unit is a basic audio interface designed for low-power applications, utilizing a dual operational amplifier (op-amp), specifically the LM1458. The choice of the LM1458 is appropriate for applications where high fidelity is not critical, making it suitable for simple audio signal processing tasks such as level adjustment or signal buffering.
The unit is housed in a compact enclosure, which could be either plastic or metal. The metal enclosure may provide additional shielding from electromagnetic interference, which can be beneficial in audio applications. The power supply is a 9V battery, ensuring portability and ease of use in various environments. The low current drain of the circuit allows for extended battery life, making this design practical for field applications.
A level control potentiometer is incorporated into the design, allowing users to adjust the output signal level to match the input requirements of connected devices. This feature enhances versatility, enabling the unit to interface with different audio equipment.
The male XLR connector serves as the output interface, commonly used in professional audio equipment. This connector type is preferred for its secure connection and balanced audio transmission, which helps to reduce noise and interference in the signal path.
A switch is included in the design to turn the device on and off, providing an easy way to conserve battery life when the unit is not in use. The overall simplicity of the circuit, combined with the use of a single dual op-amp, results in a cost-effective solution that meets basic audio processing needs without the complexity of more advanced devices.This unit would be mounted in a small plastic or preferably metal box, with a 9V battery, level control, a male XLR connector (same as on a mic) and a switch. Current drain is low, since the circuit only uses one dual opamp. There is no need for a high quality device, and a 1458 is all that is needed. 🔗 External reference
Related Circuits
The circuit utilizes two time relays, KT1 and KT2, which are connected in series with the contacts of an electric contact pressure gauge (SP). This configuration helps to mitigate issues such as tremors or sparking that may occur due...
The following circuit diagram represents a battery charger designed for a 12V car battery. This circuit includes overcharging protection, which automatically disconnects the charging circuit. Unlike typical battery chargers that continuously supply a few amperes to the battery while...
A 100 second delayed turn ON relay RL1 switch, if plug power +12V in circuit. In Fig.2 see a two range 6-60 second and 1-10 minute auto turn off relay timer circuit, with 555. Part List R1=1 Mohms C4=100nF...
The SE555/NE555 timer was first introduced by the Signetics Corporation around 1971. Pin connections and functions are as follows: Pin 1 (Ground) - This pin serves as the ground or common pin, representing the most negative supply potential of...
The circuit is constructed around a single integrated circuit (U1), specifically an MC3403P quad op-amp, three transistors (Q1-Q3), and several supporting components. It receives its input from the antenna (ANT1). The signal is processed through a high-pass filter composed...
This machine essentially does three things: It controls the process temperature, provides constant agitation of the chemical baths, and performs the timing. The operator must pour in and out the liquids by hand. The heart of the circuit is...