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Posts tagged A561

Tone Control circuit

Tone Control circuit using TR C1213 and A561 Tone Control circuit using TR C1213 and A561

Making VCO for MF-HF-VHF

It is a simple Colpits oscillator, but it has a 78L05 5v regulator (not shown) as the supply feed. The 22K and 33K resistors bias TR1 emitter to about 3v DC, which means that TR1 emitter can feed the CD4040 counter input directly when the synth is fed from a 10 volt supply. This is […]

Current Sensing Slave Power Switch using Relay

Current Sensing Slave Power Switc using BC549, BC556, relay

Led Emergency Light Circuit Diagram Without Transformer

Led Emergency Light 6v 1Ah – Circuit Diagram – 220v to 6v Without Transformer I got 6v 1Ah rechargeable batter and 220v to 6v step down without transformer.

NOISE REDUCTION PROCESSOR circuit

NOISE REDUCTION PROCESSOR circuit DOLBY B-TYPE NOISE REDUCTION PROCESSOR KA2271 DOLBY B-TYPE NOISE REDUCTION PROCESSOR KA2271 The KA2271 is a monolithic integrated circuit designed for use in Dolby* B-type reduction systems. FEATURES Few external components Low quiescent circuit current (Typ Iccq=4.3mA) High crosstalk rejection ratio. Built-in NR-switch, REC/PB-switch. Recommended supply voltage: Vcc=8V~16V.

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