Mark in Australia has put together a moving magnet phono preamplifier using a electronics hobby kit. The phono preamp kit provides everything you need except minus an enclosure and a power supply (AC walwart). The circuitry is contained on a printed circuit board (PCB) and consists of operational amplifiers (opamps) with up to three equalization compensation circuits which can be selected with jumpers or a switch. The kit comes with LM833, but you can use which ever opamp you prefer. The power supply is also on the PCB and uses 7812 / 7912 regulators. The design supports all of the common compensations and several 78 compensations as well.
The enclosure and power source need to be provided. For the power supply Mark used a walwart (15VAC) and the circuitry is contained in a plastic (ABS) enclosure. The inputs/output were moved to the rear.
7812/7912 regulators and moving magnet phono preamplifier
Subscribe to:
Post Comments (Atom)
EmoticonEmoticon