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Posts tagged telephone answering machines

Home telephone

Home telephone Home telephone Circuit using LM2575-5, 2N4400, MAC224 Home telephone Home telephone Home telephone Home telephone  Circuit using LM2575-5, 2N4400, MAC224

PRE AMP MIC

PRE AMP MIC 3 TR USING BC550C BC556 BC546 PRE AMP MIC 3 TR USING BC550C BC556 BC546 R1_____________ 1K5 R2_____________ 220K R3_____________ 18K R4_____________ 330R R5_____________ 39K R6_____________ 56R R7,R10_________ 10K R8_____________ 33K R9_____________ 150R R11____________ 6K8 R12,R13________ 100R R14____________ 100K C1_____________ 220nF 63V C2_____________ 220pF 63V C3_____________ 1nF 63V C4,C7__________ 47µF 50V C5,C6__________ […]

Circuit oscillator LM555 part 2

Circuit oscillator LM555 part 2

op amp low pass filter using TR 6922

op amp low pass filter using TR 6922 op amp low pass filter using TR 6922

Bootstrap AUDIO circuit using transistor

Bootstrap AUDIO circuit AND LAYOUT Bootstrap driver Micro circuit using TIP3055 tip2955 TIP42 tip41 MJE340 What is bootstrapping circuit? Within an integrated circuit a bootstrap method is used to allow internal address and clock distribution lines to have an increased voltage swing. Tops bootstrap circuit uses a coupling capacitor, formed from the gate/source capacitance of […]

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