JCDQ61 power amplifier delay soft start circuit board: FR4 sheet, board thickness 2mm, double-sided solder mask high-quality PCB board 85 × 74mm, thick board is not easy to deform
Use transformer within 1000W. When the power is just turned on, four 5W 12 ohm high-power resistors on the board and the transformer of the power amplifier are connected in series to limit the voltage. After a few seconds, the delay line relay is connected to 220V mains (the LED on the board is on), which can significantly reduce 220V The impact of voltage on high-power transformers, large-capacity electrolysis, and rectifier diodes (hundreds of watts and thousands of kilowatts of high-power transformers have small primary resistance, some only a dozen ohms, and the current impact is large when the power is turned on. The impact will be dark flash phenomenon). Its soft-start feature is also suitable for use in amplifiers, so that the tube filament voltage has a slow boost process, which can reduce the impact of the voltage on the filament.
Imported components assembly, high-quality relays. The on-time of the relay can be changed by replacing the delay resistance-capacitance element on the board.
If it is a transistor machine: Jianyi removes the 470U10V capacitor on the board, and buys the empty board. This capacitor is not installed to friends.
The protection principle is shown below.
JCDQ61 finished board
Board code: JCDQ-61
