Ive started some experimenting with Electrothermal Guns. My first one was 1/2″ copper pipe, with a screw in the back as one electrode, and the copper pipe as one electrode. Heres a few stills of this one fired. the last two are with no cap on one end.
The yellow cylinder is a Lego pneumatic cylinder, i used it to drop the Aluminum foil to be vaporized.
TPA6120A2 High Fidelity Stereo Headphone Amplifier datasheet
DESCRIPTION
The TPA6120A2 is a high fidelity audio amplifier built on a current-feedback architecture. This high bandwidth, extremely low noise device is ideal for high performance equipment. The better than 120 dB of dynamic range exceeds the capabilities of the human ear, ensuring that nothing audible is lost due to the amplifier. The solid design and performance of TPA6120A2 ensures that music, not the amplifier, is heard.
Three key features make current-feedback amplifiers outstanding for audio. The first feature is the high slew rate that prevents odd order distortion anomalies. The second feature is current-on-demand at the output that enables the amplifier to respond quickly and linearly when necessary without risk of output distortion. When large amounts of output power are suddenly needed, the amplifier can respond extremely quickly without raising the noise floor of the system and degrading the signal-to-noise ratio. The third feature is the gain-independent frequency response that allows the full bandwidth of the amplifier to be used over a wide range of gain settings. The excess loop gain does not deteriorate at a rate of 20 dB/decade.
FEATURES
- 80 mW into 600 ohms From a +/-12v Supply at 0.00014% THD + N
- Current-Feedback Architecture
- Greater than 120 dB of Dynamic Range
- SNR of 120 dB
- Output Voltage Noise of 5 uVrms at Gain = 2 V/V
- Power Supply Range: +/-5v to +/-15v
- 1300 V/us Slew Rate
- Differential Inputs
- Independent Power Supplies for Low Crosstalk
- Short Circuit and Thermal Protection
Current-Feedback Amplifiers
The TPA6120A2 is a current-feedback amplifier with differential inputs and single-ended outputs. Current-feedback results in low voltage noise, high open-loop gain throughout a large frequency range, and low distortion. It can be used in a similar fashion as voltage-feedback amplifiers. The low distortion of the TPA6120A2 results in a signal-to-noise ratio of 120 dB as well as a dynamic range of 120 dB.
Independent Power Supplies
The TPA6120A2 consists of two independent high-fidelity amplifiers. Each amplifier has its own voltage supply. This allows the user to leave one of the amplifiers off, saving power, and reducing the heat generated. It also reduces crosstalk. Although the power supplies are independent, there are some limitations. When both amplifiers are used, the same voltage must be applied to each amplifier. For example, if the left channel amplifier is connected to a +/-12V supply, the right channel amplifier must also be connected to a +/-12V supply. If it is connected to a different supply voltage, the device may not operate properly and consistently. When the use of only one amplifier is preferred, it must be the left amplifier. The voltage supply to the left amplifier is also responsible for internal start-up and bias circuitry of the device. Regardless of whether one or both amplifiers are used, the VCC- pins of both amplifiers must always be at the same potential.
To power down the right channel amplifier, disconnect the VCC+ pin from the power source. The two independent power supplies can be tied together on the board to receive their power from the same source.
Power Supply Decoupling
As with any design, proper power supply decoupling is essential. It prevents noise from entering the device via the power traces and provides the extra power the device can sometimes require in a rapid fashion. This prevents the device from being momentarily current starved. Both of these functions serve to reduce distortion, leaving a clean, uninterrupted signal at the output. Bulk decoupling capacitors should be used where the main power is brought to the board. Smaller capacitors should be placed as close as possible to the actual power pins of the device. Because the TPA6120A2 has four power pins, use four surface mount capacitors. Both types of capacitors should be low ESR.
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