Abstract: A power management circuitry for a peripheral electronic device includes a power regeneration circuitry, a power selector, a power switch and an audio signal detection circuitry. The power regeneration circuitry receives a continuous periodic sound wave from an audio device and converts the continuous periodic sound wave into an amplified DC electrical signal. The power source selector receives the amplified DC electrical signal and input from a primary power source and provides a power signal output. The audio signal detection circuitry receives the amplified DC electrical signal and transmits a wake-up signal to the power switch circuitry. The power switch circuitry is turned on by the wake-up signal and connects the power source selector to the peripheral electronic device main circuitry and transfers the power signal output to the peripheral electronic device main circuitry.

Abstract: The present utility provides a Debit and Credit card transaction device, wherein it comprises a microprocessor or micro-controller (MCU), a magnetic stripe card reader or a smart card reader and a power regeneration circuit, wherein the microprocessor connects with the magnetic stripe card reader or smart card reader, the power regeneration circuit and the microphone input of the communication device, wherein the power regeneration circuit connects with the microprocessor, magnetic stripe card reader or smart card reader and the headphone output of the communication device. The present utility presents a Debit and Credit transaction device which can be used in conjunction with a communication device. It is a low cost device which can carry out secure debit, PIN debit and credit transactions.

Abstract: A recording system for a Private Branch Automatic Exchange (PBAX) comprises a recording unit for recording a telephone conversation on the public line side of the PBAX and coding units for connecting to private lines of the PBAX and for identifying to the recording unit the private line in use. The recording unit may include a transformer for detecting a telephone conversation signal, a processor and a storage medium.