2805 NW 6th Street
Gainesville, Florida 32609

Phone: 352.335.6555
Fax: 352.380.0230

Custom & Private Label Projects

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MicTel Amplified Mic/line to Telephone Interface with
Studio Quality Line Level Outputs & Built-In Limiting

The New CircuitWerkes MicTel!

The MicTel replaces the handset of the telephone to provide high-quality audio for feeding and receiving information.

For non-telephone work, its balanced, studio quality inputs and outputs make it an excellent audio interface device for all kinds of remote or in-studio work. The aux. audio channel drives the headphones giving you a portable field amplifier with an IFB feed for your headphones in one compact box.

The MicTel includes a line-level, balanced input for mixing in tape players, etc.

Along with high quality audio, the MicTel features audio limiters in both the send and receive channel. These limiters are user-defeatable and begin working at about +3dBm of output. The limiter works by automatically reducing the gain of the device during high-output, peak audio thereby preventing clipping, output distortion or overdriving the telephone line.

Its audio & battery specifications will provide long life and "Broadcast Quality" audio production.

The MicTel is a great addition to your remote setup. Whether you're doing news / sports actualities, general remote broadcasting, or you just need a great little mini-audio work station for your studio, you'll appreciate the versatile features & performance of the MicTel.

Many of the MicTel's varied uses are graphically depicted in the technical manual which can be downloaded here.

Contact us or your favorite dealer for more info on this or any other CircuitWerkes product.

The MicTel combines a high quality single channel Mic amp with a headphone amp and telephone interface in a compact package that's ideal for locker room reports and other extended remote broadcasts.

Features At-A-Glance:
> Outputs for telephone handset, cellular phone or balanced line level at up to +10dBm.
> Audio inputs from phone handset, cell phone or balanced line.
> Program bus is fed by balanced mic preamp and an auxiliary balanced line input.
> Individual gain controls for send, receive and headphones levels.
> High quality, user-switchable, internal limiter prevents clipping.
> Has both 1/4" and 3.5mm stereo headphone/cue jacks.
> Headphone amp has a variable level balanced input and adjustable sidetone so you can monitor an IFB or cue return source AND/OR your program audio.
> Rugged design & Long life potentiometers for extra years of trouble-free broadcasts.
> Industry standard XLR mic and program output connectors.
> External power input with silent, auto-switching battery backup & low battery indicator
> Uses two 9V batteries or the included, CircuitWerkes adaptor.

 The MicTel Compared to the Gentner* Microtel:

The new MicTel features many improvements over the original Microtel that was first built in the early 1980s. Some of the improvements include:

The original Microtel had unbalanced inputs but the MicTel is active, balanced for both inputs and outputs.

The MicTel’s battery life is about 20 to 30+ hours compared to about 12 hours for the Microtel.

The Microtel’s maximum output level was about
-1dBm, but the MicTel has a M.O.L. of about +10dBm.
The MicTel has defeatable safety limiters to prevent line overload which the Microtel did not offer.

The MicTel headphone output is driven from its own volume control which is different than the aux. (receive) control. The Microtel’s headphone volume was only controlled by the aux. gain control.

The MicTel has a side tone adjustment for increasing the amount of send audio that you can hear in your headset. The sidetone can be applied to the headset only or to the entire aux audio chain making the studio mic sound more natural during interviews. The sidetone audio can be completely defeated when the MicTel is being used for translation services, etc.

*The Gentner name and trademark is the property of ClearOne, Inc.
CircuitWerkes & the MicTel product are not affiliated with Gentner Communications or ClearOne, Inc.
MicTel front view with legend

MicTel Rear Panel

mictel rear view with legend

CircuitWerkes MicTel Typical Specs

- Physical Dimensions: 6" L x 2-1/8" H x 5-1/16" W
- Weight: approx. 1.5 lbs without batteries.
- Power Supply Requirements: 12-16VDC or AC @ 200mA minimum. Polarity insensitive
- Two (2) 9V Alkaline Batteries, Battery life nominally 20-35 hours, depending on usage.

- Indicators: LED Low Battery Warning. Gives 15 to 45 minute battery life warning.

- Connectors:
- Microphone XLR - F (Balanced Input)
- PGM/Mic Out XLR - M (Balanced Line level)
- PGM In ¼' TRS (Balanced Line level)
- Headset ¼" and 1/8" Unbalanced
- Aux I/O In & Out ¼" TRS (Balanced Line level)
- Handset RJ-9
- Cellular 2.5" mini TRS (tip = send, ring = rcv)
- Power jack One standard 5.5mm barrel with 2.1mm id

- Audio Amplifier:
- Input Level Impedance
- Mic -60dBm >300 Ohms balanced
- PGM -10 dBm >10k Ohms balanced
- Aux I/O In -10 dBm >10k Ohms balanced
- Output Level Impedance
- Headset +4 dBm 8 Ohms min
- Mic/PGM Out +10 dBm (50Hz - 14kHz) 600 Ohms
- Aux I/O Out +10 dBm (50Hz - 15kHz) 600 Ohms
- Handset Transmit -3 dBm Max (300Hz - 3kHz) 600 Ohms
- Distortion Less than .1% (no limiting)

- Limiter:
- Threshold Level = +3 to +5dBm at MicTel's Output
- Slope = .2dB of output per 1dB rise at input
- Maximum compression = 20dB
- Maximum distortion at 10dB of limiting = less than 1%

- Power:
- Two 9Volt Alkaline batteries or 12-16Vdc external power w/auto-switched backup
- Nominal current consumption
- 55mA at full output
- 22mA at idle current

All line level measurements made into 600 Ohm load using 9V battery power.
All measurements referenced to 1 kHz.
All measurements made using the following:

  • Potomac Instruments AT-51 test set
  • Tektronix 7603 scope
  • Northeast Electronics Corp TTS-37B Measuring Set
  • HP-3551a Transmission Test Set
  • Digimax D-1200 frequency counter

Specifications subject to change without notice.