Notice that pin 2 (VIN+) is, H High CMR Isolation Amplifiers.
Switch S1 determines whether the meter reads 0-30 volts, or 0-1 amp. PIN DIAGRAM VDD2 8, possible to the input and output power supply pins of the HCPL- 7800. The meter is a one milliamp meter with an internal resistance of 40 ohms. R4 is a front panel potentiometer that sets the current limit, R22 is a front panel potentiometer that sets the output voltage (0-30 volts), & R11 is an internal trim-pot for calibration. Current limit is set by R3, D1, R4, R6, Q12, R10, & R13 providing a bias to U2 that partially turns off transistors Q9 & Q11 when the current limit is reached. A more modern design might eliminate these four parts & use a CMOS rail-to-rail op-amp. Input: 240 VAC Output: 5 V, 12 V 600 mA regulated low ripple DC voltage Thermal overload/short circuit protection (provided by IC feature) Power Battery Terminal (PBT) for easy input and output connection External On/Off switch.
Ic 7800 power supply schematic series#
D5, C4, C5, R15, & R16 provide a tiny amount of negative supply for the op amps so that the op amps can operate down to zero volts at the output pins (pins 6). The project is based on the industry popular 7800 series voltage regulator in TO220 packages. The 36 volt zen-er across C2 limits the maximum supply voltage to the op amps supply pins.
Ic 7800 power supply schematic manual#
Combining the digital IF filter, manual notch, and the 1st IF stage.
R5, C2, & Q10 (TO-3 case) operate as a capacitor multiplier. Following the design linage of the IC-7800, the IC-7851 uses a dedicated DSP unit. The other lamp (lower) lights when the unit reaches its preset current limit. With reference to the schematic, lamp, LP2, is a power on indicator.
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