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ELEKIT PS-3250

PHONO EQUALIZER AMP

HIGH QUALITY DIY (DO-IT-YOURSELF) KIT

ELEKIT PS-3250

PHONO EQUALIZER AMP

This is an RIAA turntable preamplifier to convert a turntableʼs phono-level output to an RIAA-equalized line-level signal, supporting both MM and MC cartridges by changing a jumper located on the PCB.

  • For OpAmp, a low-noise NJM2068DD is adopted.
  • In addition, for the electronic parts, ±1 % tolerance metal oxide resistors and ± 2％ tolerance film capacitors are adopted to realize small RIAA deviation and low noise.
  • For the equalizer circuit, CR type is adopted and there is no concern for the deviation of equalizing characteristics even when OpAmp is exchanged.
  • A positve and negative voltage generating circuit is on-board for the power unit, and high quality sound and wide dynamic range are secured by supplying ±15 V for OpAmp.
  • POP noise suppressor upon power ON/OFF is on-board.
  • In an equalizer amp, the noise level, especially the hum noise, depends largely on the IN/OUT wiring and the grounding location. Therefore, for this kit, IN/OUT jack and grounding bracket to fix those parts to the PCB are included.

CARTRIDGES

Supports both types ofcartridges,
MM and MC (30Ω/100Ω)

GAIN

Three, jumper selectable,
gain levels.

FLEXIBILITY

Exchangeable OpAmps to find
your own sound quality

A page from PS-3250 assembly manual

TECHNICAL SPECIFICATION
CARTRIDGES MM (approx. 47 kΩ)
MC (approx. 100 Ω or 30 Ω)
CIRCUIT CR equalizer (RIAA)
OPamp dual amplification
RIAA DEVIATION Within ±0,5 dB (20 Hz - 20 kHz)
GAIN (@ 1 kHz) 27 dB (MM, LOW-G)
32 dB (MM, MID-G)
36 dB (MM, HIGH-G)
56 dB (MC, LOW-G)
62 dB (MC, MID-G)
65 dB (MC, HIGH-G)
NON CLIP MAX. OUTPUT (@ 1 kHz) 9 V RMS
POWER VOLTAGE DC 5 V - 12 V
POWER CONSUMPTION
(OPamp: NJM2068DD)		 100 mA (5 V)
30 mA (12 V)
PCB SIZE 100 x 80 mm

PS-3250 requires external power source, stabilized DC 5 V - 12 V.

DIY - DO IT YOURSELF

Please remember that this is a DIY kit. It means that YOU will have to build it yourself using assembly manual. The kit includes all electronic and mechanical parts required to build a ready to work, high quality phone equalizer amp. It should take 1-2 hours to construct and it will need soldering. You should have some tools and soldering skills. There is not included interconnects.

TOOLS REQUIRED

Although building this kit is not hard, you will need some skills and tools. A multimeter is not required but can be useful.

  • Phillips screwdriver
  • Diagonal cutter
  • Longnose pliers
  • Scissors
  • Scotch tape
  • Hexagonal wrench
  • Soldering iron

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