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New: We're in the process of developing a new line of trigger kits. Details here.


 

Sound Trigger 2 (assembly required)

ST2

We've designed a PCB and housing for the original breadboard version of our piezo sound trigger. The simplicity of the trigger makes it especially suitable as a student project and for use by teachers in workshops.

 

The Sound Trigger 2 is powered with a 9-V battery that is mounted on the outside of the 3x2x1" box for easy access. A red LED indicates whether the trigger is on or off. See Photo 1. A single RCA output is used for connecting the trigger to a flash unit. Note that a flash trigger cable is needed for the connection. Select the RCA version below.

 

The piezoelectric sensor is soldered directly to the PCB, thereby simplifying assembly, and passes through a hole in the box on the side opposite the label as shown in Photo 2. In use, the trigger is placed on its side near the source of sound. As for any sound trigger, the delay between the production of sound and the discharge of the flash unit is determined by the distance between the source of sound and the sensor. Thus, a synchronizing delay isn't required. If, however, one wishes to generate a delay electronically, the output of the Sound Trigger 2 can be connected to the input of a Delay Timer.

 

$29.95 - ST2 Kit, unassembled

Sound Trigger ST2 front

Photo 1. Label side of the ST2

Sound Trigger ST2 back

Photo 2. Sensor side of the ST2

Resources

Parts list

Assembly instructions

Flash Trigger Cable Kits

These kits are for preparing a cable to connect the flash output of one of our trigger circuits to a PC jack. The cable kit with 3.5mm plug will work for the Multi-Trigger 3. The cable kit with RCA plug will work for the Sound Trigger 2.

 

The flash trigger cable kits include a PC-type connector for the flash, either a 3.5mm mono plug or RCA plug, 3-ft of 2-conductor cable, and heat-shrink tubing. Assembly is required.

 

Hot shoe adapterIf your flash unit doesn't have a PC jack but does have a hot shoe, the hot shoe adapter shown to the right can be used together with a flash trigger cable for flash triggering.

 

If your flash unit is one of the Vivitar models 283, 285HV, or 3700, you'll need a Vivitar PC-1 cord to connect to your flash unit. Click here for one possible source. If you're triggering your flash wirelessly or your flash unit has a 3.5mm synch jack, see this page for 3.5mm cables.

Select this cable kit for the Multi-Trigger 3. Select this cable kit for the Sound Trigger 2.
PC flash trigger cable kit with 3.5mm plug PC flash trigger cable kit with RCA plug

PC cable kit with 3.5mm plug - $4.95

(parts, unassembled above / assembled below)

PC cable kit with RCA plug - $4.95

(parts, unassembled above / assembled below)

PC flash trigger cable with 3.5mm plug RCA flash trigger cable, assembled

 

Select a flash cable kit $4.95), a hot shoe adapter ($9.95), or a combination of flash cable kit ($13.90). The latter combination saves you $1 over purchasing the items separately.

Select option


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