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Michael J. Rainey: July 2011 – Circuit Schematic
Michael J. Rainey: July 2011
Some months ago a surprise package turned up in my mailbox. Ananonymous donor had sent me threewonderful, old germanium transistors. The2N170 and a pair of 2N10...
TYPICAL TRANSISTOR CIRCUIT – Circuit Schematic
TYPICAL TRANSISTOR CIRCUIT
This is a silicon transistor circuit showing typical voltage values. When the forward base/emitter voltage is 0.6 to 0.7 V, the transistor is silicon. Germa...
Transistor Tester – Circuit Schematic
Transistor Tester
A 555 timer drives Ql through Q4 with a square wave. LED1 and LED2 light when an npn or pnp transistor respectively, are ...
Single transistor phase shifter – Circuit Schematic
Single transistor phase shifter
This circuit provides a simple means of obtaining phase shifts between zero and 170°. The transistor operates as a phase splitter, the output at point A bein...
Transistor sorter-tester – Circuit Schematic
Transistor sorter-tester
This tester checks transistor for polarity (PNP or NPN). An audible signal will give an indication of gain...
Transistor Tester with LEDs – Circuit Schematic
Transistor Tester with LEDs
This transistor has only one IC tester and can test all types of transistors. With two LEDs indicating the type of the transistor is NPN or PNP. The circuit use...
Transistor tester schematic – Circuit Schematic
Transistor tester schematic
This is a convenient design for a transistor tester. The advantage of this circuit is that transistors can be tested without actually doing the circuit solderin...
1 Transistor Toggle Relay schematic – Circuit Schematic
1 Transistor Toggle Relay schematic
The circuit below requires a double pole, double throw relay in conjunction with a single transistor to allow toggling the relay with a momentary push button. O...
Transistor tester circuit – Circuit Schematic
Transistor tester circuit
The design objective was to produce an hFE tester with switched collector currents for the DUT (Device Under Test) covering a range suitable for the selection a...
2 LED flasher with two 2N3904 transistors – Circuit Schematic
2 LED flasher with two 2N3904 transistors
This is a simple LED flasher using two 2N3904 transistors. Classic astable multivibrator using 2 transistors. Transistor is not critical. Try these: 2N4401, 2N2...
Transistor and diode tester – Circuit Schematic
Transistor and diode tester
The design shown will test PNP and NPN transistors, diodes and SCRs both "in-situ" (equipment of course de-energised) and also by direct connection to a stand-a...
Transistor Checker with 555 – Circuit Schematic
Transistor Checker with 555
This simple circuit has helped me out on many occasions. It is able to check transistors, in the circuit, down to 40 ohms across the collector-base or base-emit...
Transistor Voltage buffer Follower – Circuit Schematic
Transistor Voltage buffer Follower
Two examples of the most common types of Voltage followers (buffers). You can find some theory behind them in our amplifier gain and buffer amplifier pages.his ...
Simple Transistor Tester – Circuit Schematic
Simple Transistor Tester
This is basically a high gain amplifier with feedback that causes the LED to flash at a rate determined by the 10u and 330k resistor. Remove one of the transist...
Simple Transistor Tester – Circuit Schematic
Simple Transistor Tester
This is basically a high gain amplifier with feedback that causes the LED to flash at a rate determined by the 10u and 330k resistor. Remove one of the transist...
MOSFET Tester circuit – Circuit Schematic
MOSFET Tester circuit
This is a variation on the astable multivibrator. Circuit was recently developed to test for N-mosfets(the power kind e.g irf830). I don?t claim circuit can tes...
G STRAIN ENERGY ABSORBER – Circuit Schematic
G STRAIN ENERGY ABSORBER
It is important to know that transistors Q1,Q2,Q3 must not work like an astable (tri-phase) multivibrator (you could verify it on scope (no square waves but NON...
Transistor Tester – Circuit Schematic
Transistor Tester
When building amplifiers, it is often necessary to test transistors, either to verify that they (still) work, or for some esoteric designs it may even be necess...
Transistor Pin Identifier – Circuit Schematic
Transistor Pin Identifier
Tests transistors and diodes for polarity. A three-phase wave form is derived from the 350Hz ring-of-three oscillator formed by IC1A, IC1B and IC1C, and applied...
TRANSISTOR TESTER & SIGNAL INJECTOR – Circuit Schematic
TRANSISTOR TESTER & SIGNAL INJECTOR
There have been a lot of transistor tester circuits in recent electronics magazines, but this one is different. It has more features and includes a signal injec...