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.
PCBs and kits are available at the shop.

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 designatorValuePart number
Resistors
R175RAny 5% 1/4W resistor
R268RAny 5% 1/4W resistor
R368RAny 5% 1/4W resistor
R468RAny 5% 1/4W resistor
Capacitors
C1100nF (film)or any ceramic capacitor
C2100nF (film)or any ceramic capacitor
C3100nF (film)or any ceramic capacitor
C4100nF (ceramic)Decoupling cap, has to be ceramic
C510uF (electrolytic) 16V or more
Diodes
D11N4001any 1N400X diode
D21N4001any 1N400X diode
IC
U1TEA5114obsolete (included with PCB and kit)
Connectors
DC connectorTayda DC Power Jack 2.1mm Barrel-Type PCB Mount or Kobiconn 163-7620E-E
INRCA socketCUI RCJ-024 or Keystone 586
OUT ARCA socketCUI RCJ-024 or Keystone 586
OUT BRCA socketCUI RCJ-024 or Keystone 586
OUT CRCA socketCUI RCJ-024 or Keystone 586
PCB

Schematic:

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.

For the 3×3 version, the base circuit has been duplicated 4 times.
4 times because the goal is also to be able to use those 3 splitters as one big 1-input to 9-output  splitter or 1-input to 3-output+1-input to 6-output or 3 independent 3 way splitter.
2 DPDT switches have been added to send the signal from IN1 to IN2 (S1) and IN1 to IN3 (S2).

Bill of materials:

Ref designatorValuePart number
Resistors
R127RAny 5% 1/4W resistor
R268RAny 5% 1/4W resistor
R368RAny 5% 1/4W resistor
R468RAny 5% 1/4W resistor
R575RAny 5% 1/4W resistor
R668RAny 5% 1/4W resistor
R768RAny 5% 1/4W resistor
R868RAny 5% 1/4W resistor
R975RAny 5% 1/4W resistor
R1068RAny 5% 1/4W resistor
R1168RAny 5% 1/4W resistor
R1268RAny 5% 1/4W resistor
R13no R13
R1468RAny 5% 1/4W resistor
R1568RAny 5% 1/4W resistor
R1668RAny 5% 1/4W resistor
Capacitors
C1100nF (film)or any ceramic capacitor
C2100nF (film)or any ceramic capacitor
C3100nF (film)or any ceramic capacitor
C4100nF (ceramic)Decoupling cap, has to be ceramic
C510uF (electrolytic) 16V or more
C6100nF (film)or any ceramic capacitor
C7100nF (film)or any ceramic capacitor
C8100nF (film)or any ceramic capacitor
C9100nF (film)or any ceramic capacitor
C10100nF (film)or any ceramic capacitor
C11100nF (film)or any ceramic capacitor
C12100nF (film)or any ceramic capacitor
C13100nF (film)or any ceramic capacitor
C14100nF (film)or any ceramic capacitor
Diodes
D11N4001any 1N400X diode
D21N4001any 1N400X diode
IC
U1TEA5114obsolete (included with PCB and kit)
U2TEA5114obsolete (included with PCB and kit)
U3TEA5114obsolete (included with PCB and kit)
U4TEA5114obsolete (included with PCB and kit)
Connectors
DC connectorTayda DC Power Jack 2.1mm Barrel-Type PCB Mount or Kobiconn 163-7620E-E
IN1RCA socketCUI RCJ-024 or Keystone 586
IN2RCA socketCUI RCJ-024 or Keystone 586
IN3RCA socketCUI RCJ-024 or Keystone 586
OUT1ARCA socketCUI RCJ-024 or Keystone 586
OUT1BRCA socketCUI RCJ-024 or Keystone 586
OUT1CRCA socketCUI RCJ-024 or Keystone 586
OUT2ARCA socketCUI RCJ-024 or Keystone 586
OUT2BRCA socketCUI RCJ-024 or Keystone 586
OUT2CRCA socketCUI RCJ-024 or Keystone 586
OUT3ARCA socketCUI RCJ-024 or Keystone 586
OUT3BRCA socketCUI RCJ-024 or Keystone 586
OUT3CRCA socketCUI RCJ-024 or Keystone 586
Switches
S1DPDT ON-ONTayda Mini Toggle Switch DPDT On-On
S2DPDT ON-ONTayda Mini Toggle Switch DPDT On-On
PCB

Error: R1 is noted 75 ohm on the schematic, in order to get the same signal intensity at each output, it needs to be 27 ohm.

TEA5114 3×3 Splitter V2.1 Gerbers

Like for the simpler version, the build isn’t really difficult:

– Place and solder the 15 resistors (there’s no R13, this resistor was added by mistake and has been corrected in the last version),the 2 diodes (mind the orientation), and the 14 capacitors (mind the orientation of C5, electrolytic cap).
– Plug a 12VDC power supply, 500mA minimum, center positive and check that there is 10V at D2 cathode..
– If it’s the case, place and solder the 4 IC sockets for TEA5114,  12 RCA connectors and the 2 DPDT switches.

When a 75 ohm load is applied to each outputs  (= the 9 outputs are plugged to other devices), current consumption is around 350mA. So best is to use a 12VDC/center positive/500mA PSU at least.

How it works:

3  independant 3-way splitter

1x  6-way splitter and 1x 3-way splitter

1x 9-way splitter