The figure below shows a diagram of a device that controls a frequency of the flash lamp flashes. Existing apparatus can be used for example in discos.
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Description
Is controlled in dependence on the position of switch SW2 (type SPDT).
In the mode A (see. position SW2) flash rate adjusted using a variable resistor R7, which alters the charge time of the capacitor C5 and the switching frequency of Q1 unijunction transistor (2N4891).
In the mode B (see. position SW2) lamp flashing frequency determined by the input audio signal. Required level signal at the output of isolation transformer is set by potentiometer R10. an audio frequency alternating voltage is rectified by the diodes D4 and D5, and resistor R9 is charged through capacitor C5. and its charging time Q1 frequency determined by the amplitude of sound signal.
Turning Q1 leads to unlocking of the thyristor SCR1 (400 V, 3A) through which the capacitor C4 is discharged to the primary winding of the pulse transformer TX1.
On its secondary winding is formed of high-voltage ignition pulse (more than 4 kV). This pulse ionizes the gas in the xenon lamp, and it becomes conductive. It occurs through the lamp discharge capacitor C3 with a voltage of 600 V - light flash.
elements
- As the diodes D1-D3 can take KD105A, and as the diodes D4 and D5 - KD521A.
- As transformer TX2 - TOT205.
- Capacitor C5 - K53-1A. The remaining oxide capacitors - type K50-29. Capacitors C4, C6 - type K73-3.
- Fixed resistors, other than R1, - MLT, R1 - type VER.
- Thyristor with KU202 SCR1- LN indices.
- As a xenon lamp can take the lamp IFC-120.
- TX-1 - regular transformer IPA-120 from the flash lamp.
Important!
In operation, the circuit may experience high voltage (more than 4000 V for the pulse transformer), and therefore requires elevated precautions.
When assembling it is necessary to carefully check the polarity of the capacitors C1 and C3. It should be remembered that the elements of the device connected to the network and contact with them is not safe!
High-voltage capacitors in the circuit are able to retain a charge for some time after switching off of the network, so working with the scheme only after the complete discharge of capacitors!