About the article

AC-in, DC-out Baristors

Buildings block for application in power supplies

AC-in, DC-out Baristors
In industrial and consumer electronics, the use of thyristors and triacs is known to corrupt the AC grid voltage to a degree due to harmonics, noise, bursts and transients being superimposed on what you thought was a clean sinewave from the power outlet. A newly developed composite electronic device called the baristor can help to keep the line voltage clean yet offer good regulating properties. This article describes the baristor’s functionality as well as three practical AC-in, DC-out incarnations, on circuit boards.
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Component list

Component List

here: 180533-016-00

here: 180533-007-00

Single-threshold Baristor / PCB 160512-1 v.1.1 / Circuit Figure◦1.



R1,R2 = 680Ω 5%, 0.25W

R3 = 5.1kΩ 1%, 0.25W

R4 = 220kΩ 5%, 0.25 W

P1 = trimpot, 100kΩ 20%, 0.15W, CB10LV104M Citec-TE Connectivity


C1 = 470µF 20%, 50V, diam. 13mm, pitch 5mm


D1,D2,D3,D4,D5 = 1N4007

T1,T3 = BC557B

T2 = BC547B

T4 = BD139


K1,K2 = 2-way PCB screw terminal block, 0.2’’ (5.08mm) e.g. Phoenix Contact MKDSN 1,5/ 2-5,08

PCB 160512-1 v1.1 from Elektor Store

Component List

here: 180533-018-00

here: 180533-012-00

Single-threshold Baristor, Enhanced Version / PCB 160512-2 v.2.1 / Circuit Figure◦2.


R1 = 56kΩ 5%, 0.25W

R2 = 1MΩ 5%, 0.25W

R3 = 180kΩ 5%, 0.25W

R4,R6 = 6.8kΩ 5%, 0.25W

R5 = 330kΩ 5%, 0.25W

R7 = 1.5MΩ 5%, 0.25W, 250V

P1 = trimpot, 100kΩ


C1,C2,C3,C4 = 47nF, 50V, ceramic X7R, 0.1’’ pitch

C5 = 1nF, 100V, ceramic X7R, 0.1’’ pitch


D1,D2,D3,D4 = 1N4007

D5 = BZX79-C3V0, 3V, 500mW

T1,T4 = BCX38C, Darlington, 60V, 0.8A

T2,T5 = BC547C

T3,T6 = BD139


K1,K2,K3 = 2-way PCB screw terminal block, 0.2’’ pitch (5.08mm), MKDSN 1,5/ 2-5,08

PCB no. 160512-2 v2.1 from Elektor Store

Component List

here: 180533-019-00

here: 180533-014-00

Dressed-Down Baristor / PCB 160512-3 v.1.0 / Circuit Figure 3.



R1,R2 = 10kΩ 5%, 0.25W

R3 = 1kΩ 5%, 0.25W



C1 = 4700µF 20%, 50V, diam. 22mm max., pitch 5/7.5/10mm


D1,D2,D3,D4,D6 = 1N4007

D5 = BZX55C4V7, 4.7V, 500mW

T1,T2,T3 = BC547C

T4 = BD440 (PNP, 60V, 4A, 7A pulse, TO-126)



K1,K2 = 2-way PCB terminal block, 0.2’’ pitch (5.08mm) 630V

PCB no. 160512-3 v1.0 from Elektor Store


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