I found two different layouts of the Voltage Booster PCB which converts the 2,4 Volt battery to -15 Volt, -10 Volt and -3,6 Volt.
The battery poles connect to the center pins of the 4-pole connector, the uppermost pin is not used. The lowest pin carries one pole from the charger AC. In most cases the battery compartment and the connectors are contaminated with green salt and must be cleaned. Clean them in water with some dish-washer soap added and rinse thoroughly.
Running the SR-51-II from a 9 Volt Battery.
When the battery compartment is irreparably destroyed, you may want to connect a 9 Volt battery. The voltage may seem too high, but the battery quickly collapses down to a few volts only, because the current is about 150 to 200 mA. When switched off, the battery recovers. For doing short calculations, this method works perfectly.
Voltage Booster PCB circuit diagram.
Circuit description: on the right there is a 12 Ohm resistor in series with a diode. This resistor serves as a load to limit the AC voltage from the charger down to a maximum level. Other Texas calculators have this too, a quite surprising simple idea, but rather unconventional. Two of the driver transistors in the final booster stage are in parallel. The 14,5 Volt Zener diode limits the output voltage quite effectively. This explains why the circuit works from a 2,2 to 9 Volt range.
The SR51-II was the most sophisticated non-programmable calculator they ever made. The successor TI-51-III or TI-55 was already programmable and runs from 50mA and 9 Volt battery.
Aug 20, 2011 - output voltage of 5 V. The output voltage of the PTN78020H can be as ...... regulation circuit ultimately depends on its output capacitor decoupling network. ..... machine, or process in which TI products or services are used.
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Nov 1, 2010 - 1.1 Purpose of the Peripheral. The Universal Asynchronous Receiver/Transmitter (UART) peripheral is based on the industry standard TL16C550 asynchronous communications element, which in turn is a functional upgrade of the TL16C450. Func
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1 Nov 2010 - 1.1 Purpose of the Peripheral. The Universal Asynchronous Receiver/Transmitter (UART) peripheral is based on the industry standard TL16C550 asynchronous communications element, which in turn is a functional upgrade of the TL16C450. Funct
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