The Day...

Muscular Stimulator Project

Assembling circuit into Casing

Output Measurement Process

1. Multimeter were adjusted to DCV at 2.5.

2. The red and black lead of multimeter were connected to the electrode tip by follow the same wire colour of the electrodes.

3. Muscular Stimulator circuit are switch “on” by push the on/off button.

4. Current intensity control were adjusted until multimeter show a measurement.

5. The measurement show the DCV scale were increase at 25V.

6. Then 25V were multiplied by 2.5 which is the range that has been selected.

7. The calculation is 25 x 2.5 = 62.5. It shows that the output voltage of the Muscular Stimulator circuit were 62.5V positive.

Audio Amplifier Circuit for Rain Sound Effect

Audio amplifier circuit is a circuit that are combined with the Muscular Stimulator circuit for producing the relaxation sound, rain sound effect. It is an electronic circuit for amplification of signals within or somewhat beyond the audio frequency range (generally regarded as 20 to 20,000 Hz). Audio amplifiers may function as voltage amplifiers (sometimes called preamplifiers), power amplifiers, or both. The function of audio amplifier to amplify a weak signal to a level capable of driving a loudspeaker or other type of transducer such as headphones at the desired sound level. Power amplifiers may have power ratings ranging from less than 1 W to several hundreds of watts.

Audio amplifier circuit use TDA2822 as the audio amplifier IC. TDA2822 is a dual low voltage power amplifier that are designed for portable cassette players and radios. It has several features such as wide operating supply voltage – Vcc = 1.8V to 12V, low crossover distortion, low quiescent circuit current and bridge/stereo configuration.

TDA 2822 pin configuration

Raining Sound Effect : Your best relaxation aid

When anyone are looking for the right nature sounds, their initial impulse is typically to find a setting or multiple settings that consist of rain in them. Rain is a fairly mysterious thing. It has a highly comforting effect on people, and that's precisely why rain sounds have become so well known.

For starters, why is rain so well known as a nature sound setting? I think this is true because as people it is a natural relaxing sound for us. It's possible that it is as a result of the repetitive and delicate sound, and that you can easily safely enjoy it without the need for actually being outside and becoming soaked!

This aid can be the best partner for the muscular stimulator as it will give relaxing effect while doing stimulation.

Drilling and Soldering Process