infra-red controlled remote switch

Nowadays, several manufacturers produce ICs that combine an infra-red receive LED with associated amplifier and demodulator. The type SFH505A from Simens used in present circuit has, in addition, a band-pass filter to minimize any interface. It is best used in conjunction with an infrared transmitter in the next article. The output of IC1  is limited to a[…]

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UHF remote control receiver

The receiver is intended primarily for use with the remote control UHF transmitter described in the preceding article. It is a super-regenerative type with an active RF amplifier, T1. The antenna signal is applied to the input inductor via a BNC socket, The input circuit is tuned by trimmer C4. The amplified RF signal is[…]

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UHF remote control transmitter

This low-power UHF FM transmitter is intended for remote control applications such as garage doors and wireless alarm systems. It is a single transistor design that operates at a frequency reserved for low-power wireless signaling. The operating frequency is determined by a resonator, F1. The following types may be used: UK: Type 82528 for 418[…]

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Burr-Brown

REF200 from Burr-Brown

Burr-Brown’s REF200 provides in independent 8-pin DIL package two independent current sources, either of which can supply 100 NA and a 1:1 current. mirror. The pinout of the device is shown in Fig. 1. Note that there are no pins for connecting a supply voltage. The correct operation of the current. sources are, however, guaranteed[…]

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