Synchronization of the second flash. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Home, household, hobby
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For portraiture and a number of other special types of shooting with the use of a flash, it often becomes necessary to illuminate the object from different angles, but ... The standard "blitz", alas, does not give the desired effect.
The proposed home-made device allows you to turn on the sync contacts of one camera not one, but two flashes at once (FV1, FV2), which achieves shadowless illumination of objects captured on film.
Unlike previous shootings, where the lamp-source of bright light is ignited from a pulse transformer, on the primary winding of which a high-capacity capacitor is discharged (through the camera's SC sync contact), here a pair of thyristors is additionally involved in the work.
Part of the discharge current of the flash capacitors through the galvanic isolation diodes VD1 and VD2, the closed sync contact SK and the limiting resistors R1 and R2 is fed to the control electrodes of the thyristors VS1 and VS2. The SB1 button is used to reset the charge if the object was not photographed.
The circuit diagram of the device is so simple that even a novice in electrical and radio engineering can assemble it quite quickly. In addition, this requires a little radio components, and all of them are inexpensive and affordable. Installation - hinged, familiar to everyone from school physics lessons. And as a case, a plastic box with dimensions of 50x40x30 mm is used.
Schematic diagram of a device for switching on two "blitzes" from the synchrocontact of one camera
After the first operation, followed by the ignition of the standard display on the flash units, the device is ready to be used for shooting an object.
Author: A.Sidorovich
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