impedance makes it possible to connect multiple devices, like the SHA2, with high impedance to the output without having any significant effect on the quality of the signal. This is called bridging the output.

Wondering what impedance is? If you know about resistance you know, or I’ll tell you, resistance is a measurement, in ohms, of the amount of resistance to current flow in a DC circuit. Like a garden hose that is crimped. There is less water (current)) flowing in the hose because of the crimp (resistance)).

Impedance is the same thing but is used to describe resistance to an AC current flow. Why the difference? The resistance (impedance)) of an AC circuit is affected by the frequency of the AC signal but there is no frequency involved with a DC signal. The impedance of an amplifier input will be different for every signal frequency applied to it but a circuit which has only DC current will always be the same. When an impedance is specified it is usually for a frequency at the center of the range expected.

What about H1 and H2?

Notice that the input to the looping buffers have a set of jumpers, H1(H2), feeding them. These jumpers allow you to choose between the direct input feed to the SHA2 or the output of the LM1036 processor. By connecting a jumper between pins 1 and 2 of the headers the buffered output is simply whatever the input is. If the jumper is placed between pins 2 and 3 the buffered output becomes the processed signal provided to the headphone amplifiers.

Let’s say that you want to use your SHA2 to listen to the record level output of your amplifier because it does not have a headphone jack but you also want to be able to record the program you are listening to. Yes you could simply connect a ‘Y’ adaptor to the output and plug in the recorder. But what would happen if the cables to the recorder became shorted to ground. Now you loose the signal to everything connected to the recorder output. The looping buffer in the SHA2 will prevent the recorder form affecting your headphones if the recorder is defective.

Now let’s consider a situation where you have several power amplifiers that are connected to speakers in different areas. You want to control all the levels from one central location. By connecting pins 2 and 3 on the headers you can feed all the amplifiers from the SHA2 and have your monitor headphones too.

How about feeding one signal to a string of monitors for your band. Simply daisy chain the SHA2’s using the looping buffers. The possibilities are nearly endless. The choice is yours.

SHA2 • 6

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Ramsey Electronics SHA2 manual What about H1 and H2?
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SHA2 specifications

Ramsey Electronics SHA2 is a state-of-the-art digital transmitter designed for a wide range of applications, including DIY projects, short-range communication, and remote sensing. This powerful device allows users to transmit audio, data, and control signals wirelessly with outstanding clarity and reliability.

One of the standout features of the SHA2 is its transmission range, which can reach up to several hundred meters depending on the environment and conditions. This capability makes it an ideal choice for various applications, from hobbyist projects to more complex commercial uses. The SHA2 operates in the 2.4 GHz ISM band, which is a widely used frequency range that provides robust performance and minimal interference from other electronic devices.

The SHA2 incorporates advanced Frequency Hopping Spread Spectrum (FHSS) technology, enhancing its resilience against potential disruptions. By rapidly changing frequencies during transmission, FHSS minimizes the chance of interference and improves the overall signal integrity, ensuring a stable connection even in crowded environments. This feature is particularly beneficial for applications that require reliable and consistent data transmission.

Moreover, the SHA2 is equipped with powerful modulation schemes that support various encoding methods. As a result, users can transmit different types of signals, including analog audio, digital data, and even coded control signals. This versatility allows for creative approaches to problem-solving in diverse fields, such as automation, security systems, and wireless audio transmission.

In terms of user-friendly design, Ramsey Electronics has made the SHA2 easy to integrate into existing systems. Its compact size, along with clearly marked connection points, allows for streamlined installation. The module's low power consumption is another critical advantage, making it suitable for battery-operated devices and applications that prioritize energy efficiency.

The SHA2 is also compatible with various microcontrollers and development platforms, ensuring seamless connectivity regardless of the user's preferred technology. With its durable construction and excellent performance specifications, the Ramsey Electronics SHA2 stands out as a reliable choice for anyone looking to leverage wireless communication technology effectively. In summary, the SHA2 excels in transmission range, interference resistance, versatile signal encoding, user-friendly integration, and energy efficiency, making it a prime candidate for both hobbyists and professionals alike.
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