Article
Audio/Video Switch
This article is mainly about the board and the uses to which it can be put. The circuit is simplicity itself and consists of four phono sockets, which can be individually switched to a fifth (common) socket. This fifth channel can be used as either an input or output. A big advantage of this type of passive switch is that the channels are electrically isolated from each other, as well as from the supply voltage for the relays. If this is not required, it is of course possible to connect all earths of the boards together.
Materials
Gerber file
CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor GREEN and GOLD members can exclusively download these files for free as part of their membership. Gerber files allow a PCB to be produced on an appropriate device available locally, or through an online PCB manufacturing service.
Elektor recommends the Elektor PCB Service service from its business partner Eurocircuits or AISLER as the best services for its own prototypes and volume production.
The use of our Gerber files is provided under a modified Creative Commons license. Creative Commons offers authors, scientists, educators and other creatives the freedom to handle their copyright in a more free way without losing their ownership.
PCB
Component list
Resistors:
R1,R4,R7,R10 = 1MOhm
R2,R5,R8,R11 = 3kOhm 9
R3,R6,R9,R12 = 1kOhm 2
Capacitors:
C1 = 4µF7 63V radial
Semiconductors:
D1-D4 = 1N4148
T1-T4 = BC547B
Miscellaneous:
JP1 = wire link (see text)
K1-K5 = cinch socket, PCB mount, e.g., Monacor/Monarch # T-709G
Re1-Re4 = mini relay, 2 c/o contacts, e.g., Conrad Electronics # 505170-24 (12V, 720Ohm )
R1,R4,R7,R10 = 1MOhm
R2,R5,R8,R11 = 3kOhm 9
R3,R6,R9,R12 = 1kOhm 2
Capacitors:
C1 = 4µF7 63V radial
Semiconductors:
D1-D4 = 1N4148
T1-T4 = BC547B
Miscellaneous:
JP1 = wire link (see text)
K1-K5 = cinch socket, PCB mount, e.g., Monacor/Monarch # T-709G
Re1-Re4 = mini relay, 2 c/o contacts, e.g., Conrad Electronics # 505170-24 (12V, 720Ohm )
Discussion (0 comments)