DiscoverCircuits.com, has 30,000+ electronic
circuits, cross-referenced
into 500+ categories. We have searched the web to help you
find quick design ideas.
We make every effort to link to material posted by the designer.
Please let us if you would like us to link to or post your
design.
Three-transistor modulator-amplifier circuit works with swept-control
frequencies - 22-April-10 Issue of EDN-Design Ideas Many
applications require a circuit to perform pulse modulation and voltage
amplification to drive a load with a train of impulses. A typical
application is driving a piezoelectric generator.... [Design Idea by
Horia-Nicolai L Teodorescu and Victor Cojocaru, Gheorghe Asachi Technical
University, Iasi, Romania]
Tips on the MP3 Player Kit - The kit version of the MP3 player
has been released. This document is tips for building the MP3 player
kit and modification hints. (added 10/05)
Tone Control - Based on the classic Baxendall tone control circuit, this
provides a maximum cut and boost of around 10dB at 10K and 50Hz. As the controls are
passive, the last transistor provides a slight boost. The output…. [Designed by Andy
Collison]
Top-Level OTL Tube Headphone Amplifier - This article shows my
tube headphone amplifier designs for driving headphones with an impedance
of 200 to 600 ohms (I am using these amplifiers with the Sennheiser 580,
which has a 300-ohm impedance). The problem with many tube headphone
amplifiers....(Circuit design added 07/06)
Transistor Audio Amplifiers - Figure 1 is an interesting audio
amplifier which provides almost a watt of audio with a very low standby
current of only 45 milliamps. This circuit is really a current repeater
formed by Q2 and Q3 and driven by Q1. This circuit is similar in
performance to many IC amplifiers but requires an initial bias adjustment.
R2 controls the bias and should be adjusted so that exactly ½ of the
supply voltage is measured at the collector of Q3 with no signal. Once
adjusted, heat sinks are not needed for Q2 and Q3.... [Radio Amateur
Society of Norwich]
Transistor Organ - This simple circuit can provide hours of
enjoyment as you learn tunes, play duets or just make some really weird
sounds by pushing all the buttons at once. You have probably seen this
circuit before, it is fairly common. I have seen it in several… [Designed
by Aaron Cake]
Tube Amplifier Kit - The amplifier kit uses two 11MS8 tubes per
channel. The two DC blocking capacitors and the four coupling capacitors are
metallized polyester, while Samsung aluminum electrolytic capacitors are used to
filter the solid-state power supply. ….(design added 11/08)
Tube Headphone Amplifier/Preamp with Relay-Based Input & Power Switching -
A tube headphone amplifier inspired by the "Top-Level" and "No-Compromise" amps
of Andrea Ciuffoli, except that the output stage uses a triode-connected
pentode. Because this amp also serves as a preamp, the author has put in a
sophisticated relay-based switching system (both input source selection and
power supply). T....Designed by Helmut Ahammer (Circuit design added
08/08/08)
