This tester consists of two integrated remote control receivers whose outputs drive an LED to indicate when a suitable infrared signal is received. To cover all current infrared remote controls, one receiver (the TSOP1736) has maximum sensitivity to carriers at 36 kHz, and the other (the TSOP1738) to carriers at 38 kHz.
This tester consists of two integrated remote control receivers whose outputs drive an LED to indicate when a suitable infrared signal is received. To cover all current infrared remote controls, one receiver (the TSOP1736) has maximum sensitivity to carriers at 36 kHz, and the other (the TSOP1738) to carriers at 38 kHz.
The other LED (D3) indicates when power is applied. The LEDs are white with a minimum output of 20,000 mcd at 20 mA, which means that even at 5 mA (the maximum output current of the receiver ICs) the indicator LED will light reasonably brightly. In his prototype, the author used 5 mm LEDs with an output of typically 55,000 mcd at 20 mA.
The Zener diode reduces the supply voltage for the receiver ICs to about 4.3 V. In fact, they will operate reliably down to about 3.2 V. The circuit is powered from a 9 V PP3-style (IEC: 6LR22) battery and will function until the battery voltage falls to about 7 V.
TSOP-1738 Characteristics
- The minimum and Maximum Input Voltage are -0.3 and 5V respectively. Typically +5V is used.
- Can detect IR signals from Remotes (38kHz)
- Operating current: 5mA
- High Range and wide coverage area.
- Will respond only to IR signals, due to high immunity against ambient light
- Low power consumption
- Has an in-built preamplifier
- TTL and CMOS compatible
Note: Complete Technical Details can be found in the TSOP1738 datasheet given at the end of this page.
TSOP1738 Specifications
- Supply Voltage: 5 V
- Power consumption: 0.4 to 1.0 mA
- Min. Ee irradiation: 0.35 mW/m2 typ.
- The angle of detection: 90
- Dimensions of the casing (mm): 12.5 x 10 x Thickness 5.8
- Temperature range: -25 C to +85 C
