sahib
Well-known member
As a result of my collaboration with Mr Graham Langley I am throwing my hat on the ring with two new kits under Total Audio Control brand. MICPRE ONE and EQ ONE (launched in the Equalisers forum).
The kits can be ordered either through the WHITE MARKET or directly from the web site www.totalaudiocontrol.com
MICPRE ONE
MICPRE ONE is one of the first in our flagship “Designed by Langley” series of pro-audio products. Yes, it is indeed designed by the man himself. The "real"stuff.
MICPRE ONE is similar in topology to the transformerless design Graham used on the Amek M2500 mixing console and the original Angela console of 1982.
A number of improvements have been made, but the design retains the use of parallel matched transistors and constant current sources. Exceptional noise performance has been achieved. Particularly at low gain settings. The signal path is balanced throughout.
0dB to 66dB of gain is selected in 6dB steps by a rotary switch and this is followed by the fader stage which provides an additional 4dB of gain and up to 24dB of control to adjust between switch settings and also to attenuate the final output to suit consumer interface.
Switches are fitted for input impedance selection, a passive high pass filter before the preamplifier, phase and phantom power.
A high impedance balanced instrument input is also provided on a front panel jack.
An additional switch selects the source for a second front panel that can provide a balanced “THRU” output directly from the instrument source, or monitor off the main path.
When the MON switch is OFF the THRU output at the front is connected to the INSTRUMENT channel and gives a balanced intsrument output. In this mode the microphone and instrument inputs are used at the same time. While the microphone input makes use of the full gain stage, the instrument in/out is at unity gain. In other words the instrument channel acts as a buffer.
However, when the MON switch is ON the THRU output connects to the microphone channel and gives a split output at the same level as the main output. In this mode the instrument input is disabled.
When the INST switch is ON the microphone input is disabled and instrument input makes use of the full gain stage and the THRU output again provides a split output at the same level as the main output.
An 8 segment pre fader LED meter is provided. The Signal Present LED illuminates at -18dBu. The response of the main bar approximates that of a PPM, while the +18 LED has faster attack and slower decay to catch peaks.
Typical specification, both paths:
Mic. input impedance: switchable 5k ohms/600 ohms
Instrument input impedance: switchable 1.5M ohms/50k or 10k ohms
High pass filter: 120Hz @ 6dB/octave (nominal).
Frequency response: +/- 0.5dB, 20Hz-80kHz (up to 60dB gain).
Phase response (EQ out): +/-30 deg., 20Hz-80kHz (up to 60dBgain).
Maximum output (into 100k ohms): +27dBu
THD&N (+10dBu input signal): better than 0.05%, 20Hz-20kHz (up to 60dBgain).
Mic. EIN, 22Hz-22kHz, RMS, 150 ohm source: -128dBu.
Output impedance (main and THRU): 75 ohms
The Kit
The kit comes complete with all the components and a comprehensive assembly manual with detailed photographic illustration of each assembly sequence.
http://www.totalaudiocontrol.com/docs/MICPRE-ONE-ASSEMBLY-MANUAL_26DEC13-LTl0Qp.pdf
However, as well as having a support thread here, there will also be unlimited e-mail support.
Here are some images.
Mic Amplifier Card.
Instrument Input and Meter Card
The kits can be ordered either through the WHITE MARKET or directly from the web site www.totalaudiocontrol.com
MICPRE ONE
MICPRE ONE is one of the first in our flagship “Designed by Langley” series of pro-audio products. Yes, it is indeed designed by the man himself. The "real"stuff.
MICPRE ONE is similar in topology to the transformerless design Graham used on the Amek M2500 mixing console and the original Angela console of 1982.
A number of improvements have been made, but the design retains the use of parallel matched transistors and constant current sources. Exceptional noise performance has been achieved. Particularly at low gain settings. The signal path is balanced throughout.
0dB to 66dB of gain is selected in 6dB steps by a rotary switch and this is followed by the fader stage which provides an additional 4dB of gain and up to 24dB of control to adjust between switch settings and also to attenuate the final output to suit consumer interface.
Switches are fitted for input impedance selection, a passive high pass filter before the preamplifier, phase and phantom power.
A high impedance balanced instrument input is also provided on a front panel jack.
An additional switch selects the source for a second front panel that can provide a balanced “THRU” output directly from the instrument source, or monitor off the main path.
When the MON switch is OFF the THRU output at the front is connected to the INSTRUMENT channel and gives a balanced intsrument output. In this mode the microphone and instrument inputs are used at the same time. While the microphone input makes use of the full gain stage, the instrument in/out is at unity gain. In other words the instrument channel acts as a buffer.
However, when the MON switch is ON the THRU output connects to the microphone channel and gives a split output at the same level as the main output. In this mode the instrument input is disabled.
When the INST switch is ON the microphone input is disabled and instrument input makes use of the full gain stage and the THRU output again provides a split output at the same level as the main output.
An 8 segment pre fader LED meter is provided. The Signal Present LED illuminates at -18dBu. The response of the main bar approximates that of a PPM, while the +18 LED has faster attack and slower decay to catch peaks.
Typical specification, both paths:
Mic. input impedance: switchable 5k ohms/600 ohms
Instrument input impedance: switchable 1.5M ohms/50k or 10k ohms
High pass filter: 120Hz @ 6dB/octave (nominal).
Frequency response: +/- 0.5dB, 20Hz-80kHz (up to 60dB gain).
Phase response (EQ out): +/-30 deg., 20Hz-80kHz (up to 60dBgain).
Maximum output (into 100k ohms): +27dBu
THD&N (+10dBu input signal): better than 0.05%, 20Hz-20kHz (up to 60dBgain).
Mic. EIN, 22Hz-22kHz, RMS, 150 ohm source: -128dBu.
Output impedance (main and THRU): 75 ohms
The Kit
The kit comes complete with all the components and a comprehensive assembly manual with detailed photographic illustration of each assembly sequence.
http://www.totalaudiocontrol.com/docs/MICPRE-ONE-ASSEMBLY-MANUAL_26DEC13-LTl0Qp.pdf
However, as well as having a support thread here, there will also be unlimited e-mail support.
Here are some images.
Mic Amplifier Card.
Instrument Input and Meter Card
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