日本オーディオ List of Products and Services

The product has a 30-year history! It features a voltage-controlled sine wave oscillator module utilizing state-variable filters, characterized by a wide variable range, fast response speed (within 0.1 mS), and low distortion (below 0.1%). Additionally, the frequency change in response to the control voltage can be either linear or logarithmic. The set frequency accuracy (linearity) is extremely high, within 1%. 【Features】 ■ Flat amplitude characteristics within ±0.5 dB over a range of 10,000 times ■ High-performance compact module for easy integration ■ Purely electronic design ensures long-term stability ■ Logarithmic frequency setting type with 90-degree phase-shifted output ◇◆◆◇◆━━━━━━━━━━━━━━━━━━━━━━━━━ We have included the latest data on 'distortion rate characteristics' and 'control voltage to frequency linearity errors' in our catalog. Please take this opportunity to have a look. ━━━━━━━━━━━━━━━━━━━━━━━━━◇◆◆◇◆

• filter

This device is an improved version of the frequency-selective, rapid cutoff characteristic low-pass filter PGF-8, with significant enhancements in noise and distortion achieved through a review of its components and circuits. Noise in the high-frequency range has been reduced to below 60%, and the second harmonic distortion has been significantly decreased. The average current consumption has also decreased by about 10%. It features a low distortion rate filter that can handle up to 12 frequencies through a switch. This filter switches frequencies using a 4-bit (line) control signal. Its primary application is as an anti-aliasing low-pass filter for AD converters. The filter characteristics are of the 8th order Chebyshev type, available in two types: 130dB/oct and 100dB/oct. ◇◆◆◇◆━━━━━━━━━━━━━━━━━━━━━━━━━ For more details on "distortion rate" and other specifications, please take this opportunity to download the "latest specification sheet" or feel free to contact us. ━━━━━━━━━━━━━━━━━━━━━━━━━◇◆◆◇◆

• Amplifier
• Other electronic parts

All types of filters with characteristics such as LP, BP, HP, and BEF (bandwidth removal) are fully equipped. The variable range of the "cutoff (center) frequency" is extensive, over a thousand times. With a control voltage from +10 mV to +10 V, there is practically infinite setting resolution. The set frequency is accurately proportional to the control voltage (with an error of about 1% or less). The pass characteristics also have an error of within 0.5 dB across the entire range. It is not a photocoupler but a pure electronic type, ensuring fast response and stable operation over long periods. It features an easy-to-use pin layout. Due to analog processing, it has low noise and a wide dynamic range of over 80 dB.

• filter

A "voltage-controlled" sine wave oscillator module characterized by a wide variable range, fast response speed (within 1 mS), and low distortion (below 0.1%). The practical variable range is ten thousand times, and the high-precision range is one thousand times. The setting frequency accuracy (linearity) is extremely high, within 1%. It maintains a flat amplitude characteristic within ±0.5 dB even in the ten thousand times range. It is a high-performance compact module that is easy to integrate, guarantees long-term stability with a pure electronic design, and offers a rich lineup including logarithmic frequency setting and 90-degree phase-shifted output.

• filter

The CR-tuned oscillator "LDO-1" is an ultra-low distortion rate oscillator, ultra-low distortion rate high-pass filter for measurement, and ultra-low distortion rate buffer amplifier developed to support the automation, acceleration, and high precision of measurements. These products are characterized by their compact size, lightweight, and low cost, while pursuing high-speed measurement and high accuracy. For more details, please download the catalog.

• Ultrasonic Oscillator
• Amplifier

The CR-tuned oscillator "LDH-100" is a modified model of the ultra-low distortion oscillation module "LDO-1." It features a wide bandwidth specification with an upper frequency limit of 100 kHz, and a high-speed switching specification that stabilizes the amplitude within one second after frequency setting. The output voltage is over 4 Vrms (when the output terminal is open), and the output resistance/load resistance is below 50 ohms/above 600 ohms. For more details, please download the catalog.

• Ultrasonic Oscillator
• Amplifier

The measurement amplifier "LDA-1" is an ultra-low distortion amplifier using 2-pole amplifier technology, while the LDB-2 is an ultra-low distortion buffer with internal buffered connections. It is the ideal amplifier for applications requiring ultra-low distortion rates, and considerations for sound quality have been thoroughly addressed to also allow for use in audio applications. For more details, please download the catalog.

• Amplifier

The small audio amplifier "LDA-2 S/D" is an ultra-low distortion amplifier unit using 2-pole amplifier technology. It has been condensed to 1/3.5 of the volume of the conventional LDA-1 using the latest know-how. This device was developed specifically for audio applications, but it also has sufficient performance to be used in distortion measurement-related equipment. For more details, please download the catalog.

• Amplifier

The programmable filter "PGF-8" is a filter that switches frequencies with a 4-bit (line) control signal. Its main application is as a low-pass filter for anti-aliasing in AD converters. The filter characteristics are of the 8th order Chebyshev type, available in two types: 130dB/oct and 100dB/oct. Frequencies can be specified up to 12 frequencies as a custom order. For more details, please download the catalog.

• Amplifier
• Other electronic parts

The logarithmic/inverse logarithmic amplifier "LGA-1" is a voltage input type log-antilog amplifier module developed specifically for measuring instruments that require high precision and high stability. It is compact, lightweight, and low-cost, making it suitable for a wide range of applications. The input and output sides have separate grounds, which prevents the generation of error voltage due to ground currents. For more details, please download the catalog.

• Amplifier

The logarithmic/inverse logarithmic amplifier "LGA-3AL/L" is a more compact and lower-cost version of the highly stable log amplifiers LGA-1 and LGA-2. While the trimming accuracy has been slightly relaxed, the basic components and other parts are mostly the same as those used in LGA-2. For more details, please download the catalog.

• Amplifier

The voltage-controlled variable gain amplifier "VCA-1" is a 2-channel voltage-controlled amplifier using a transconductance variable method. It is a compact and user-friendly module that houses two channels in one case. The two VCAs can be used in series, allowing for a significant attenuation of 80dB to 100dB even at frequencies of several hundred kHz, which is difficult to achieve with a standard volume control. For more details, please download the catalog.

• Amplifier

The voltage-controlled variable gain amplifier "NA101A" is a voltage-controlled amplifier module with a wide variable range and high logarithmic linearity. It is a module dedicated to AC signals, and using an inverting amplifier for gain adjustment allows for independent adjustment of gain scale and gain reference, making it convenient. For more details, please download the catalog.

• Amplifier

The F-V converter "FV-1" is a ripple-free FV converter that combines a pulse-smoothing method with a pulse-synchronized sample board circuit. It directly converts signals with a smoothing ripple content of several tens of percent (DC) into zero-ripple voltage, resulting in an improvement in response speed by more than one digit. For more details, please download the catalog.

• converter

The analog multiplication/division calculator "MPD-1" is a multiplication/division calculator operating in the first quadrant (where X, Y, and Z are all positive), providing high precision and high stability calculations within a range of +1m to +10V (10000 times) for each input. When all inputs are positive (in the first quadrant), it is easier and more advantageous to achieve high precision and high stability. For more details, please download the catalog.

• others

The auto-ranging module "AR-1" is a DC amplifier module equipped with an automatic gain switching function that continuously displays the full scale of a 3 (4) digit 1/2 DPM (Digital Panel Meter). When applied to a digital panel meter (DPM), this device allows for the full use of significant digits, enabling high-precision display. For more details, please download the catalog.

• Amplifier