Marker Generator Circuit

The marker generator circuit explained here is a constant- frequencyoscillator driving into a CMOS divider chain. Switchable out- puts from the divider chain are selected to drive a pulse generator. The oscillator is C1a in which R1 biases the IC into linear operation. The crystal determines the basic frequency of operation at 4 MHz in […]

Read More »

Sine Wave Oscillator Circuit

To maintain oscillation the op. amp. must have a gain equal or exceeding this attentuation which is in fact x3. The desired gain is obtained by selecting the ratio of feedback resistance to input resistance of the inverting input (RV2 + R3)/R2. lf the overall gain, including feedback, exceeds unity the circuit will produce sine […]

Read More »

Signal Injector Circuit

While troubleshooting amplifier and audio related equipment, a signal injector circuit becomes one of the most essential tools, here we learn how to make a signal injector circuit. Here is a two in-one test instrument incorporating a signal injector and a signal tracer. If any audio equipment is not working, an audio signal can be injected at the volume […]

Read More »

Exponential Waveform Generator Circuit

This exponential waveform generator circuit provides you with a waveform which sinks exponentially from a specific voltage to near-zero, after which quickly resets to reactivate the sequence. In the beginning C1 is charged to +12V, and O1, O2 are each off. The timing capacitor at this time there discharges gently by means of R1, the […]

Read More »