It took 1 day and 44 years.
A Pleiades step up transformer was made to increase the delicate ribbon microphone's signal which already has its internal transformer giving 25-50Ω output impedance. The Oleiades transformer is connected after this transformer, steps up the signal as normal input trasformer do and at the same time compensates for the bass proximity effect so that the mic can be used at 4in with natural frequency response from singer's vocal cords to listener's brain. [1]
The core used is the Magnetec Nanocrystalinne M073.
Primary winding is 14 turns of wire wrap orange wire giving and inductance of 4.7mH.
Secondary is 280 turns of 0.1mm enamel wire giving and inductance of 3.1H.
The transformer was placed inside an XLR female to male adapter.
It was then connected to the Pleiades K117 JFET impedance matching preamplifier inside a black female Neutrik XLR which is then connected by a video green cable and powered directly from the ipad's headphone mic socket.
The sound of singing voice was amazingly natural at 4in.
So was acoustic guitar.
Setup:
Living room - 4in - Grampian GR1/L - Pleiades 4.7mH:3.1H - Pleiades K117 - iPad - GarageBand - Sennheiser HD 580
[1] Sound Picture Recording and Reproducing Characteristics - D.P.Loye and K.F.Morgan - J.S.M.P.E.
A Pleiades step up transformer was made to increase the delicate ribbon microphone's signal which already has its internal transformer giving 25-50Ω output impedance. The Oleiades transformer is connected after this transformer, steps up the signal as normal input trasformer do and at the same time compensates for the bass proximity effect so that the mic can be used at 4in with natural frequency response from singer's vocal cords to listener's brain. [1]
The core used is the Magnetec Nanocrystalinne M073.
Primary winding is 14 turns of wire wrap orange wire giving and inductance of 4.7mH.
Secondary is 280 turns of 0.1mm enamel wire giving and inductance of 3.1H.
The transformer was placed inside an XLR female to male adapter.
It was then connected to the Pleiades K117 JFET impedance matching preamplifier inside a black female Neutrik XLR which is then connected by a video green cable and powered directly from the ipad's headphone mic socket.
The sound of singing voice was amazingly natural at 4in.
So was acoustic guitar.
Setup:
Living room - 4in - Grampian GR1/L - Pleiades 4.7mH:3.1H - Pleiades K117 - iPad - GarageBand - Sennheiser HD 580
[1] Sound Picture Recording and Reproducing Characteristics - D.P.Loye and K.F.Morgan - J.S.M.P.E.
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