Zero suppressor for IC17106

Many people are irritated by the superfluous zero that precede a number on, for instance, a liquid crystal (Lc) display. To them ‘1’ is clearer than ‘001’. In systems where the ICL7106 display is used, this irritation may be removed by the present suppress. Both the backplane (BP) and the segment of a 1CL7106 arc[…]

Read more

Low-drop diode

At high currents, many silicon diode has a forward voltage of 1 V or more. There are types whose drop at currents of up to 2-3 A is limited to 0.5-0.6 V, but even that may cause unacceptably high losses. The circuit described here offers a possible remedy. The cathode, C, of T1, a SIPMOS[…]

Read more
test probe

General Purpose Test Probe

The compact test probe is made from five transistors, three LEDs, a zener diode, and three resistors. It enables rapid ‘measurement’ of voltage levels at digital gates, fuses, diodes, batteries, and others. Of course, it does not provide absolute values, but rather a good indication of correct operation or otherwise. Measurements are carried out with[…]

Read more
Zener Bridge Rectifier

Zener Bridge Rectifier Circuit Diagram

The supply described here uses two zener diodes and two rectifier diodes instead of the usual four rectifier diodes and one zener. Zener Bridge Rectifier Circuit Description: Assuming that the potential at junction D1-D3 is positive with respect to that at D2-D4 and is greater than the zener voltage (+0.6 V), D3 will act as[…]

Read more