TEA5114 Video Splitter
This circuit is a utility circuit. The base circuit is a 3 way video splitter by Hervé Cadinot, which uses TEA5114, a RGB switcher/amplifier. The point of using this integrated circuit in this application is that there is an amp for each R,G, and B channel, so it’s possible to use it to amplify 3 composite video signal, the goal is to be able to distribute the source signal to 3 different monitors without loss.
Here is the base circuit::
R1 adapt the impedance from the source, C1 to C3 are coupling capacitors, which will remove any DC offset from the signal. The 3 amps in the TEA5114 amplifies the source signal and R2 to R4 + TEA5114 outputs impedance gives around 75ohm at the output.
The power supply is composed of 2 diodes that make the voltage drop from 12V to 10V, C5 is a filtering cap and C4 is a decoupling cap for the TEA5114.
Bill of material:
| Ref designator | Value | Part number |
|---|---|---|
| Resistors | ||
| R1 | 75R | Any 5% 1/4W resistor |
| R2 | 68R | Any 5% 1/4W resistor |
| R3 | 68R | Any 5% 1/4W resistor |
| R4 | 68R | Any 5% 1/4W resistor |
| Capacitors | ||
| C1 | 100nF (film) | or any ceramic capacitor |
| C2 | 100nF (film) | or any ceramic capacitor |
| C3 | 100nF (film) | or any ceramic capacitor |
| C4 | 100nF (ceramic) | Decoupling cap, has to be ceramic |
| C5 | 10uF (electrolytic) 16V or more | |
| Diodes | ||
| D1 | 1N4001 | any 1N400X diode |
| D2 | 1N4001 | any 1N400X diode |
| IC | ||
| U1 | TEA5114 | obsolete (included with PCB and kit) |
| Connectors | ||
| DC connector | Tayda DC Power Jack 2.1mm Barrel-Type PCB Mount or Kobiconn 163-7620E-E | |
| IN | RCA socket | CUI RCJ-024 or Keystone 586 |
| OUT A | RCA socket | CUI RCJ-024 or Keystone 586 |
| OUT B | RCA socket | CUI RCJ-024 or Keystone 586 |
| OUT C | RCA socket | CUI RCJ-024 or Keystone 586 |
| PCB |
Schéma:
TEA5114 3-way Splitter Gerber files
Assembly is quite straight forward:
– Place and solder the 4 resistors, then the 2 diodes, then the 5 capacitors and finally the power connector.
– Plug a 12VDC PSU and check that you have 10V at D2 cathode.
– If that’s the case, place and solder the TEA5114 and the 4 RCA connectors.
When a 75 ohm load is applied to each outputs (= each output is plugged to a device), current consumption is around 90mA. So best is to use a 12VDC/center positive/200mA PSU at least.