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I use this circuit in preference to the more normal capacitor discharge/SCR setup as it can be controlled by relays and computers. The pulse length is a function of the 4u7 capacitor and the power supply voltage.
When the switch transfers it sends a positive pulse through the 4u7 capacitor to drive the transistor for a fixed time. The original TIP32 transistors are now replaced by BD681 and the 4u7 replaced by a 1u0 capacitor.
There is no recovery time except that required to allow the power supply to regain its 16 volts if it has a low power capacity.
I use this circuit in preference to the more normal capacitor discharge/SCR setup as it can be controlled by relays and computers. The pulse length is a function of the 4u7 capacitor and the power supply voltage.
When the switch transfers it sends a positive pulse through the 4u7 capacitor to drive the transistor for a fixed time. The original TIP32 transistors are now replaced by BD681 and the 4u7 replaced by a 1u0 capacitor.
There is no recovery time except that required to allow the power supply to regain its 16 volts if it has a low power capacity.
LINK TO IMAGE - mtr-2.gif
Circuit Schematic
