Friday, December 12, 2014
Broadcast Transmitter Circuit Diagram
In this circuit, a 74HC14 hex Schmitt trigger inverter is used as a square wave oscillator to drive a small signal transistor in a class C amplifier configuration.The oscillator frequency can be either fixed by a crystal or made adjustable (VFO) with a capacitor/resistor combination.
Intercom Circuit with Transistors
This is a 2-station simple intercom circuit build based on transistors part and using common 8R mini speakers. The speaker works as microphone and generate sound, so there is no need microphone for this intercom. The "press-to-talk" switches should have a spring-return so the intercom can never be left ON, push on switch can be used for this kind of task.
Voltage inverter circuit
This voltage inverter circuit powering a dual supply op amp from a single battery problem. The circuit simply takes a positive voltage and inverts it. It uses only one 555 timer and a few other passive components, so it doesn't add much in the way of size and cost to a project.
Thursday, December 11, 2014
Voltage Inverter Circuit
This simple and inexpensive circuit can produce a dual (positive and negative) voltage from a single supply input.
It is therefore extremely useful for powering opamp and other circuits that require a dual voltage from a single battery.
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