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Model 109 Arbitrary Waveform and Pseudo-random Noise Generator
Especially designed for audio system testing. Produces white noise, pink noise, and an arbitrary waveform read from an EEPROM. Initially furnished with a "10-sine" waveform, the EEPROM can be quickly reprogrammed over an RS-232 link. With control software. Our WAVEMAKE (tm) software makes it easy to generate other waveforms.

Model 405 Analog Data Collection Module
Especially designed for field data collection using a laptop or notebook host computer. It features a 12-bit output at a maximum sampling rate of 69 kHz. The built-in rechargeable batteries and cast aluminum enclosure enhance unwanted signal rejection. It also has a built-in peak detector and analog meter so you can set the input voltage for full dynamic range without clipping.

Model 412 Audio Attenuator-Amplifier
A general purpose audio attenuator and amplifier in an easy-to-use instrument. Its features include 80 dB of attenuation in four decade steps plus fine attenuation in each step with a single-turn linear pot; 40 dB of gain in steps of X1, X10, X20, X50 and X100; wide bandwidth, low DC offset, and low harmonic distortion. It was developed to condition a computer's sound card output to drive other equipment but it is useful any time you need to attenuate or amplify an audio signal.

Model 414 Stereo Utility Amplifier
A general purpose audio amplifier designed for making audio measurements and to serve as a utility preamp. It has stereo inputs and stereo outputs as well as a mono output which is the sum of the stereo inputs. The mono output is in-phase with the stereo outputs. Its features include 26 dB of gain in steps of X1, X2, X5, X10 and X20; low-noise, wide bandwidth, low DC offset, and low harmonic distortion. It is power-mains operated and the cast aluminum enclosure minimizes the pickup of unwanted signals.

Model 439 Two-Channel Attenuator-Amplifier
A general purpose audio attenuator and amplifier in an easy-to-use instrument. Its features include a 118 dB range (-78 dB to +40 dB) in one dB steps as set by a rotary encoder with the gain settings displayed on a one line LCD. The channel gains may be set independently or together depending on the position of the SET GAIN switch. A power amplifier is included to drive a stereo headphone for audiometric testing or other use.

Model 601 Highpass/Lowpass Tunable Filter
Easily implements tunable highpass, lowpass and bandpass filters. The unit contains a tunable 8-pole Butterworth highpass filter and a tunable 8-pole Butterworth lowpass filter. Corner frequencies can range between 100 Hz and 40 kHz and can be set from the front panel or by a host PC computer over a serial link. The unit has an input analog lowpass filter, an output analog lowpass filter and a variable gain amplifier with gain steps of x1, 2, 3, 5 and 10. The controlling microprocessor is put in sleep mode when it's not programming the filter to eliminate its clock noise from the output.

Model 803 ISD25xxxx Programmer and Test Board
The model 803 is a programmer, tester and playback board for the ISD25xxxx series of analog record/playback IC's manufactured by Information Storage Devices, Inc. This series includes storage durations from 60 to 120 seconds. The board has automatic and manual record modes and an on-board audio power amplifier for playback through an external speaker (speaker not included).

The Sound Strobe^TM
This is NOT a TDL® product but we have found it useful so we are including it on our test equipment page. It's a small, portable instrument that produces six selectable spectrum shape pulse signals to help you identify problems with your speakers and their interactions with your listening room.