Circuits FAQ

This is the Archive of Electronics Design related Question & Answers. Ask Questions at EE BBS FAQ. To get a project designed by delabs visit Design Service.

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Tuesday, December 08, 2015

Digital Counter - 4029 and 4511

I just about the circuit you made. what kind of IC is 4029N & 4511N? Is it a diver/decoder? I tried to research on the datasheet but it cannot give exact specification...

Mail from JT from Philippines

4029 is a Preset Dec-hex, up-dn, Counter - and 4511 is a 7-Segment Display decoder. Learn more see .
Ssend a jpeg photo or rtf or pdf. please also tell me which page or circuit is this question about. any other doubts feel free to ask.

 Is it this ... Simple Digital Counter - doc00021

Digital Counter4029 and 4511


yes, .thanx for the links..i'll try to go over with the where can we purchase those items if ever we need it?

Reply from JT

It depends on which country you are in,... see this page Components Materials


Thursday, December 03, 2015

Lead Acid Batteries FAQ

Some Questions, Searches about Batteries Answers Below, My Collection of Website Resources.


The Lead Acid Batteries are used in Automobiles and UPS - Uninterrupted Power Supplies. Battery Banks and Arrays are used in Home and Industrial Power Systems with Solar and Wind power charging too.

Chargers & Charging -- Battery Management

These batteries have survived many other types, for rugged high power usage, even beyond 100Kva. It is all the more important for us, to learn how to use them properly. Intelligent charge controllers and charge-discharge cycle regulating managers, will ensure a long lifespan for optimum cost-effective usage of this Electro-Chemical Wonder.

Comparing marine batteries Gel, Absorbed Glass Mat (AGM), flooded lead acid

"While I was on a month long assignment in Washington DC in 1999, I read an article on battery management in the 1999 Ocean Navigator "Annual" issue that I thought was deeply flawed. The contributor, Chuck Husick, illustrated how he thought one should maintain and configure a marine battery system."
 Shown above is a Sealed Lead Acid Batter from Power Sonic Corporation (Europe)

Wednesday, December 02, 2015

Power Oscillator Circuit Design

I am trying to find a circuit diagram for a long time, which will give me the o/p Characteristics as 12V, 0.5A & 4000 Hz (or variable frequency). Will you please help me in this regard? I will be very very thankful to you.

Mail from PS

First make an Oscillator and then Power Amplify it.

LM675 Power Operational Amplifier

"The LM675 is capable of delivering output currents in excess of 3 amps, operating at supply voltages of up to 60V. The device overload protection consists of both internal current limiting and thermal shutdown. The amplifier is also internally compensated for gains of 10 or greater. "

Op Amp Booster Designs  PDF

"The design of booster stages which achieve power gain while maintaining good dynamic performance is a difficult challenge. The circuitry for boosters will change with the application’s requirements, which can be very diverse. A typical current gain stage is shown in Figure 1."

Op Amp Booster Designs

12V, 0.5A & 4000 Hz (or variable frequency) is possible, very high frequencies difficult, for that you have to study RF behavior. Experiment from DC to 1 M Hz, no more with these circuits. 200/300 K Hz if you manage you learn't something. Study pages, learn and try to build it yourself. These links are for learning.


I am extremely thankful to you for your precious reply for my mail. I have tried it to complete the circuit as per your suggestion, but the results are not as per the requirements. Here, I tell you the exact situation. Sir, I am working on the efficiency improvement of an alternator. for this reason I need a frequency generator circuit which will give me the o/p characteristics as 12V, 0.5A & variable frequency upto 4000Hz. The signal must be AC sine waveform. It can be applicable to inductive load. The i/p will be simply 230V AC. Will you please design a circuit for such requirements?

I am in great need of this. Please, I request you to design it. I will be very very thankful to you.

Reply from from PS IN

For professional service, there will be design charge. Your reply will be posted. Anyone who can design this can comment here.

Unique IC Buffer Enhances Op Amp Designs, Tames Fast Amplifiers

A unity gain IC power buffer that uses NPN output transistors while avoiding the usual problems of quasi-complementary designs is described. F