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Omnicron Electronics - Professional Voice Logging Recorders and Accessories - since 1975



This condensed TCC-14 manual does not include all drawings, schematics, parts lists, circuit board photos, etc. that are in the manual supplied with the clocks.


The Omnicron TCC-14 Talking Clock/Calendar provides a truly practical way to log the time of day and the date on magnetic tape. When used with Omnicron voice logging recorders, you will have documentation of exactly when each conversation was recorded. The recorded announcements of the time and date not only verify when messages are received, they permit you to easily locate previously recorded messages. The speech is produced electronically. There are no tapes or discs to break or wear out. Routine servicing is not required.

Vocal announcements of the time and date are in the form of computer generated speech. They are available either on demand or continuously. Seven internal programming switches permit the announcements to be customized to meet specific needs. You can turn the year and date off, select the seconds to be announced, select 12 or 24 hour format, etc. A monitor speaker with on/off switch and a "PUSH-TO-TEST" switch allow you to listen to the announcements.

TCC-14 Talking Clock drawing with call-outs

The time and date are easily set using front panel switches. Accuracy is maintained by a quartz crystal. A built-in battery supplies power to the time keeping circuitry during power outages or interruptions. Screw terminals on the rear panel allow for rapid installation with Omnicron recorders and other devices that require verbal announcements of the time of day. Connections are also provided to power the clock from an external source of 12 volts AC or 12 volts DC. Each clock is supplied with a 110/120 volt AC power adapter.


Plug the power adapter into a standard 110/120 volt AC outlet. If DC power is to be used, an external source of 12 to 14 volts DC should be connected to the terminals marked "EXTERNAL POWER SOURCE - 12V AC or DC" on the rear panel of the clock. Only one source of power can be connected to these terminals at a time. Place the speaker switch in the "ON" position.

When power is applied, the talking clock may make some unusual sounds as if it were clearing its throat. It can take up to 15 seconds before starting to talk properly. This is normal for anyone who has awakened.

If you have received the standard TCC-14 clock that was ordered to supply continuously repeating announcements, it should be repeating the time and date over and over. If you have the TCC-14A clock which was ordered to supply on-demand announcements, momentarily depress the "TEST" push button to hear an announcement. If the clock does not talk, check the "what to do in case of difficulty" section in the back of this manual.

The clock has two "AA" size batteries that power the time keeping circuitry during power outages. If your clock forgets the time during lengthy power outages (over 5 minutes), replace them with two fresh batteries.

Use a coin to turn the battery compartment cover 1/2 turn counter-clockwise. Remove the old batteries and install the new batteries with their positive (+) terminals toward the back of the clock. Replace the cover. New batteries should last between two and five years.

If your clock has the factory installed "TCC-B" option, there also will be an internal 12 volt rechargeable battery and charging circuitry to power all clock functions during the loss of external power. Clocks with this optional circuitry will have a switch on the back panel labeled "BATTERY BACK-UP ON/OFF". Place this switch in the "ON" position to activate the battery. If the battery has been allowed to completely discharge, it will take up to 72 hours for it to be completely recharged. It will charge with the switch in either the "ON" or "OFF" position.

If the time or date being announced is not correct, the clock must be informed of the correct information.

Note that the "SET" and "ADVANCE" buttons will time-out if not pressed within five seconds, and the time will be set to whatever was programmed up to that point. Also note that the time is programmed into the clock in the same order that the clock speaks the time.

This is done as follows:

1. Press the "SET" button, keeping it depressed until the clock stops talking. When you release the button, the clock will announce the hour that is stored in its memory. If the hour is incorrect, press the "ADVANCE" button to advance to the next hour. Notice that the clock will go to the next hour each time the "ADVANCE" button is depressed. Setting the hour is always done in the twenty-four hour format, even though the clock may be in the AM/PM announcement mode. One PM will be announced "THIRTEEN", two PM will be announced "FOURTEEN", three in the afternoon will be announced "FIFTEEN", etc. Advance to the correct hour.

2. Press the "SET" button again. The clock will say the minute that is stored in its memory. Press the "ADVANCE" button to advance to the correct minute. Holding the "ADVANCE" button down will cause the clock to continuously advance.

3. Press the "SET" button again. The clock will say the month that is in its memory. If the month is incorrect, press the "ADVANCE" button until the correct month is announced.

4. Press the "SET" button again. The clock will announce the day of the month. If the day is in-correct, press the "ADVANCE" button until the correct day is announced.

5. After any of the above actions you can wait for five seconds and the clock will automatically be set to the values last announced. However, if it is necessary to change the year, pressing the "SET" button again will start the year setting sequence. If the "SET" button is pressed to set the year, the clock will announce a two digit number between 00 and 99. This register should be set for the tens and units of the year. Press the "ADVANCE" button until the correct number is announced.

6. Now that the year has been set, the clock will wait until the "SET" button is pressed before regular operation begins. This is to permit you to synchronize the clock to another time source. The clock will set the seconds counter to zero when the "SET" button is pressed to end the time keeping procedure.

The number set into the year register is used by the clock to determine leap year status. Even if you do not wish the clock to announce the year, it should have the correct year set into its memory. If the number set into the year is evenly divisible by 4 (96, 00, 04, etc.) it will count 29 days in February. If the number is not evenly divisible by 4 it will count 28 days in February.

Now that the time has been programmed into the clock, the clock should be continuously repeating the correct time and date if it is in the continuously repeating mode. If it is set to on-demand operation, the "TEST" button must be used to cause the clock to talk. Pressing the "TEST" button when the clock is set to continuously repeat is not necessary — you will hear the time whenever the speaker switch is in the "ON" position.

This indicator will light up green whenever the clock has power. If the light goes off, check to see if the clock is connected to external AC or DC power and that the fuse on the rear panel is good.

The "LEVEL" control on the rear of the clock is used to adjust the volume of the audio that is available at the "OUTPUT" terminals on the back of the clock. This control should be adjusted up or down as required for optimum operation of your recorder. The "LEVEL" control does not change the volume of the time setting speaker that is built into the clock. The time setting speaker will be disconnected if the front panel speaker switch is in the "OFF" position. Back panel audio will not be affected by the position of the speaker switch. The speaker switch is normally used only when calibrating or testing the clock.

Inside of the clock is an eight section programming switch. Use the switch to select the following options :

1. Announce the year "00" to "99".

2. Produce a "BEEP" prior to each announcement.

3. Announce the seconds.

4. Continuously repeat announcements. (Off for on-demand announcements.)

5. Do not announce the date.

6. Announce the time "ON-THE-HOUR", in on-demand mode only.

7. Announce in 24 hour format.

8. Calibrate 32.768 kHz time-base at IC12 (MM58274) pin # 13.

If you wish to change the clock’s announcement sequence by activating or de-activating any of the above actions, first remove the cover from your clock by removing the two 6x32 screws from each side and lift the top off. Locate the eight position DIP switch which is near the front center of the circuit board. The switch has eight small slide switches that are numbered from one to eight. Sliding a switch lever towards the right side of the switch (looking at it from the front of the clock) will tell the clock to perform the operation stated in the above listing. Sliding the switch lever to the left will turn off that feature.

After you have set the clock to announce the time/date/etc. in the selected format, replace the top cover. Switch number eight should always be left in the "OFF" position unless the clock is being serviced.

The clock can be customized (at extra cost) to meet specific requirements. These options can be ordered with your clock, or your TCC-14 can be returned to the factory to be retrofitted.

Clocks ordered with the "A" option (TCC-14A) have an optically isolated sensing input that will trigger an on-demand announcement from the clock whenever this input (labeled "CONTROL" on the back of the clock) has a voltage between 5 and 15 volts AC or DC applied to it and the voltage drops below 2 volts. It also has a DPDT relay that has been wired so that when the clock is NOT talking whatever is connected to the terminals labeled "IN" on the back of the clock will be switched to the terminals on the clock labeled "OUT". When the clock talks, the relay will energize and disconnect the "OUT" terminals from the "IN" terminals and connect it to the time announcement audio that can be adjusted with the level control. A timer prevents the clock from being re-triggered for about 15 seconds.

You can tell if your clock is the TCC-14A version by looking at the rear panel terminal strip. If the terminal strip has "IN", "OUT" and "CONTROL" markings you have the TCC-14A.

This option is required if the clock is used with older Omnicron recorders which did not have a separate channel for recording continuously repeating announcements. It is also used in other applications where automatic time announcements are required, such as with telephone answering machines, with dial-up time services, etc.

Option "TCC-B" provides a built-in 12 volt 1.2 amp rechargeable battery, a battery ON/OFF switch, and a circuit to charge the battery when the clock is powered from an external AC source. When external power is lost, the battery automatically takes over and will power all clock functions for up to four hours. All TCC-14 clocks have built-in batteries to maintain their time keeping functions without external power. The TCC-B option keeps it talking during short power outages.

If your recorder has a separate track or channel dedicated to time announcement recording, such as Omnicron VLR-1CT, VLR-4CT, or VLR-8CT recorders, all you have to do is connect the audio from one of the clock’s "OUTPUT" terminals to the time track input jack on your recorder. With Omnicron recorders, this jack is labeled "CLOCK". If the clock is not continuously repeating the time or time and date (clocks ordered with the "A" option), you will have to switch internal programming switch #4 to the "ON" position. Adjust the "LEVEL" control on the back of the clock to increase or decrease the volume of the recorded time announcements as required.

One clock can provide continuously repeating time announcements for over 50 recorders. Three sets of parallel output connections are provided on the back of the clock, OUTPUT-1, OUTPUT-2, and OUTPUT-3. If you run out of space for connecting the recorders on the back of your clock, an external junction point can be used.

If your voice logging recorder has a single track for recording both the conversation and the time announcements, such as the older Omnicron CTR-8FS and CTR-9FS recorders, the TCC-14A clock is required. When properly connected to the clock, your single channel recorder will be automatically switched away from its normal input source (telephone audio, radio, etc.) after each recording is over and an announcement of the time and date will be fed into the recorder.

The following three steps should be followed to connect your single channel recorder to the TCC-14A clock:

1. Use a cable that has spade lugs on one end and a miniature phone plug on the other end labeled "CLOCK". The spade lug end of this cable connects to the "CONTROL" terminals on the rear of the clock. Plug the other end of this cable into the jack on your recorder that is connected to drive motor power. On Omnicron CTR-8FS and CTR-9FS recorders this jack will be labeled "CLOCK".

2. Use a cable that has spade lugs on one end and a miniature phone plug on the other end labeled "AUX". The spade lug end connects to the "OUT" terminals on the rear of your clock. Plug the other end into the "AUX" (auxiliary audio input) jack on the recorder.

If you are using the TCC-14A with an audio coupler such as the LIC-390, LIC-39M, LIC-39B, LIC-100, or LIC-10M, the coupler must be connected between the clock’s "OUT" terminals and the recorder following the instructions supplied with the coupler. Only one cable should be connected to the "OUT" terminals. If you are using a coupler, the direct connection cable will not be required.

3. Connect the source of audio you wish to record to the "IN" (input) terminals on the back of the clock using a suitable cable. Do not connect directly to telephone lines, balanced audio circuits, or circuits that have a DC voltage on them without using a coupler.

When a message is received, the recorder starts to record and continues to record until the conversation is over or there is a lengthy silent period. As soon as the recorder stops, the clock electronically disconnects the recorder from the source being recorded and connects it to the clock audio through the "LEVEL" control. After a complete announcement has been recorded, the clock will reconnect the recorder to the input source.

The TCC-14A will not be re-activated for about 15 seconds after a recording of the time has been made. This delay permits voice-activated recorders to stop without re-triggering the clock. The time will only be announced after new recordings.

1. When we say the time will be announced, we mean that the date also will be announced unless internal programming switch #5 is in the "ON" position.

2. There is a trimmer potentiometer near the LM386N audio amplifier circuit that can be used to adjust audio gain for optimum fidelity.

3. There is a trimmer capacitor between the internal programming switches and the MM58274 time keeping circuit. To adjust the time keeping accuracy, unplug the clock, switch programming switch #8 to the "ON" position, reconnect power and measure the crystal frequency at (IC12) MM58274 pin 13 with a precision frequency counter. If it does not read 32.768 kHz, adjust as necessary. Return switch #8 to the "OFF" position.

4. A trimmer resistor is provided to adjust the frequency (tone) at which the voice synthesis circuit will operate. It is located in the corner of the circuit board near the 74LS374 IC (IC10). Adjust this control for natural sounding announcements. An incorrect setting of this control can cause the voice to sound strange.

If a problem develops, check that all connections are correct and secure, that all switches and adjustments are in their correct positions, that the equipment is plugged into a live "AC" outlet, and that the fuse is good.

If the clock does not talk properly, or if it cannot be set in the normal way, a complete reset may be required to get it going again.

To reset the clocks speech circuitry, first unplug the clock from the AC power source, and if your clock has the TCC-B option, switch the battery back-up switch to the "OFF" position.

After power has been off for at least 5 seconds, depress the "SET" button and while keeping it depressed, re-connect power. After the power has been on for at a few seconds, release the "SET" button. The clock should have re-initialized itself and start talking after a few seconds. Re-set the time and date if needed.

If you require assistance in the installation or operation of your clock, contact your place of purchase or:

OMNICRON ELECTRONICS, 581 Liberty Highway, P.O. Box 623, Putnam, CT 06260-0623, VOICE: (860) 928-0377, FAX: (860) 928-6477.



POWER: 110 VAC 50/60 Hz, or 12 VAC/DC, 6 watts
SIZE: 7-3/4" W x 3-1/2" H x 8-1/4" D, 6 lbs.
ACCURACY: Within +/- 15 seconds per month at 25C
WARRANTY: Limited, 1 year parts and labor

This Omnicron product is warranted against defects in materials and workmanship for one year from the date of purchase. Omnicron will, at its option, repair or replace products that prove to be defective during the warranty period provided they are returned to Omnicron Electronics. Repairs necessitated by misuse, accident, improper installation, unauthorized modifications, or use in violation of the operating instructions, are not covered by the factory warranty, nor are cases where the serial number has been removed, defaced, or changed.

No other warranties are expressed or implied, including but not limited to the implied warranties of merchantability and fitness for a particular purpose. Omnicron Electronics is not liable for consequential damages.

Should your clock become defective within the warranty period, we will repair it without charge. Should it require service that is not covered by the warranty, Omnicron will repair it for a nominal service charge plus the cost of parts and transportation.

If factory service is required, pack securely and forward by United Parcel Service (UPS) or insured Parcel Post (USPS) to:

581 Liberty Highway
P.O. Box 623
Putnam, CT 06260-0623

Enclose a note explaining what is wrong. Include your name, address, and telephone number. Omnicron Electronics also offers telephone help:

VOICE: (860) 928-0377              FAX: (860) 928-6477
Electronic mail:    WEB Site:



                          Prevent costly mistakes - record all important phone and two-way radio conversations. Compact, economical recorders that document every word of your important conversations.       
                                   OMNICRON ELECTRONICS
                        554 Liberty Highway Unit 2, Putnam, CT  06260   

(860) 928-0377

(860) 928-6477


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