Interface ICL7135 Voltmeter to 89C52
2020-11-13
This circuit is a Parallel interface between 89C52 of Atmel with 7135 of Intersil. With This circuit you can read analog data of both polarities. You can change the rangeRead More
80C39 and MCS48 based Process Controller
2020-07-17
The Early Microcontroller : 80C39 is a CMOS Version of 8048 the one that preceded 8031-8051. MCS48 is the set for that, MCS51 is the current set. Digital to AnalogRead More
Battery Backup for SRAM or Microcontroller
2019-11-21
This circuit can be used as a low cost SRAM and Microcontroller or Microprocessor Battery Backup. All the diodes are 1N4148, The diodes prevent battery discharge back to power source.Read More
Digital to Analog Converter with uC Watchdog
2019-02-16
This is the continuation of the earlier post. Part of 80C39 based Process Controller. In this schematic you can see the Watchdog and D/A Converter. 80C39 and MCS48 based ProcessRead More
Battery Backup Supply
2019-02-16
This is a 9V power supply which will work even on power failure. It uses a rechargeable battery and regulators. A transformer with 15-0-15 AC volts output is required. FromRead More
Digital gain control of Opamp.
2018-08-23
The gain of U1 can be controlled by a digital binary 1248 nibble at ABC. The gain at digital 000 is unity or 1 and the gain at various stagesRead More
555 based Reset Generator
2018-02-13
You must have read all the circuits and explanation on the other pages at delabs to understand this, as i cannot repeat the same thing as i have done itRead More
Crystal Oscillator – Parallel Resonant
2017-11-18
74HCU04 is a chip that was made for this purpose, HCT may not work for such a circuit. C1 and C2 can go to upto 33pF and R2 can beRead More