Troubleshooting Instructions, Conclusion

Connect an audio output device such as a speaker or headset to the appropriate jack (J1 or J2, respectively). With switch S1 in the off position you should be able to hear the tone under test.

Set switches S2 and S3 in the “out” position for maximum bandwidth. Push in switch S1 to energize the circuit.

Adjust R14 for the proper volume level.

You can now experiment with your kit by changing the tone frequencies with the audio generator and following with the center frequency adjustment of the AF1.

By changing the position of switches S2 and S3 you can change the bandwidth of the audio filter. The chart describes the switch/bandwidth for the AF1.

Bandwidth S2 S3 (Hz)

100 IN IN

250IN OUT

500OUT IN

750OUT OUT

You should be able to “hear” the differences in the bandpass filters. Try and plot a few data points for frequency vs loudness and you should be able to plot the different bandwidths. This is by no means an exact measurement but it is impressive that this digitally controlled switched capacitance filter is responding to your commands -and - you did it yourself!

TROUBLESHOOTING INSTRUCTIONS

While we had hoped that it wouldn’t come to this, if you’re having trouble with your kit here are a few suggestions. Use a methodical trouble shooting technique - a clear head and a voltmeter are all that are usually required to correct any problem. Rest assured that both of the MF8 IC’s have been pre- tested before they were included in your kit. More times than not a part in the wrong place causes the problem, so ask a friend to check your work as well. Try not to be discouraged, working backwards through the assembly steps will usually lead you to the problem.

CONCLUSION

We sincerely hope that you have enjoyed the construction and use of this Ramsey Kit. As always, we have tried to compose our manual in the easiest, most “user friendly” format that is possible. As our customers, we value your opinions, comments, and additions that you would like to see in future publications. Please submit comments or ideas to:

Ramsey Electronics Inc. Attn. Hobby Kit Department 590 Fishers Station Drive Victor, NY 14564

And once again, thanks from the folks at Ramsey! AF1 • 14

AF1 specifications

Ramsey Electronics AF1 is a state-of-the-art audio frequency oscillator, renowned for its versatility and performance in various electronic applications. Designed for hobbyists and professionals alike, the AF1 is an essential tool for anyone working with sound generation, modulation, or detection.

One of the main features of the AF1 is its wide frequency range, spanning from 1 Hz to 100 kHz. This broad coverage enables users to generate tones suitable for a multitude of tasks, from simple audio testing to more complex signal modulation in communication systems. The AF1 provides a stable wave output, which is critical in maintaining audio fidelity and ensuring accurate readings in testing environments.

The AF1 employs advanced technologies to achieve its remarkable performance. One of these is its precision frequency control, which allows users to set the output frequency with accuracy. This is facilitated by the device’s inclusion of a calibrated variable resistor, enabling fine adjustments for precise frequency generation. Additionally, the AF1 features a built-in frequency counter that simplifies the process of monitoring the output frequency, providing users with a valuable tool for troubleshooting and calibration.

Another characteristic that sets the AF1 apart is its dual output channels. This allows for the simultaneous generation of two distinct frequencies, offering greater flexibility in applications requiring complex audio signals or dual-tone generation. The outputs are adjustable in amplitude, which helps users tailor their signals according to specific requirements, whether for testing speakers or experimenting with audio synthesizers.

The AF1 is also designed with ease of use in mind. The interface is intuitive, featuring a straightforward layout of dials and switches that enables quick adjustments and settings. This user-friendly approach is ideal for those who may not have extensive experience with electronic signal generators.

Constructed with high-quality components, the RAMSEY AF1 ensures durability and reliability, making it suitable for both fieldwork and laboratory settings. Its compact design allows for easy transport, fitting seamlessly into any toolkit.

Overall, the Ramsey Electronics AF1 is a powerful audio signal generator equipped with a rich feature set, including extensive frequency range, dual outputs, precision control, and intuitive usability. Whether you are a hobbyist, educator, or professional, the AF1 is a valuable asset for any electronic project involving sound generation.