TREE

Long-Interval Pulse Generator Circuit Diagram. A rectangular-wave pulse generator with an extremely long period can be built using only two components: a National Semiconductor LM3710 supervisor IC and a 100-nF capacitor to eliminate noise spikes. This circuit utilises the watchdog and reset timers in the LM3710. The watchdog timer is reset when an edge appears on the WDI input (pin 4). If WDI is continuously held at ground level, there are not any edges and the watchdog times out. After an interval TB, it triggers a reset pulse with a duration TA and is reloaded with its initial value. The cycle then starts all over again. As a result, pulses with a period of TA + TB are present at the RESET output (pin 10).  Long-Interval Pulse Generator Circuit Diagram   Long-Interval Pulse Generator Circuit Diagram As can be seen from the table, periods ranging up to around 30 seconds can be achieved in this manner. The two intervals TA and TB are determined by internal timers in the IC, ...

Using a MC14093 CMOS type IC, a quad 2-input NAND Schmitt trigger circuit can be designed a very simple pulse width modulation circuit controller electronic project . This pulse width modulation controller electronic project is very simple and require few external electronic parts . The speed is adjustable from 0-max. Max rpm is 2/3 the supply voltage. Supply voltage that can be used in this project can be between 3 and 18 volt . Pulse Width Modulation Controller Schematic MC14093 CMOS type IC can be directly interchanged with the MC14011 CMOS IC . Input pins 8, 9, 12, and 13, need to be connected to Gnd. or 'V+'. Output pins 10 & 11 are left floating. Maximum current draw, with the components shown, is approximately 220 mA max using a small type motor. P1 potentiometer can be a multi-turn type if your needs are towards specific rpm's. For Q1 transistor can be a IRF513, IRFZ42I IRF620 or IRF511 type . To minimize RFI (Radio Frequency Interference), put a Ferrite Bead on...

Electronic Pulse Generator And Signal Tracer Circuit Project. Dual-purpose test-instrument, Very simple circuitry, 1.5V Battery-operated. This simple circuit generates narrow pulses at about 700-800Hz frequency. The pulses, containing harmonics up to the MHz region, can be injected into audio or radio-frequency stages of amplifiers, receivers and the like for testing purposes. A high-pitched tone can be heard from the speaker of the device under test when all is working properly. The clip must be connected to the ground of the device under test, touching with the probe the different stages of the circuit, starting from the last stage and going up towards the first. When the tone is no longer heard, the defective stage has been found. Connecting an earclip or headphone to J1, the circuit will automatically change into a two-stage amplifier and any audio signal coming from the device under test and picked-up by the probe will be heard through the headphones. The testing of a circuit shou...