A lot of FM transmitter circuits have been already published here. This just another one, a simple two transistor FM transmitter. The first stage of the circuit is a preamplifier stage based on transistor Q1. This is a collector to base biased amplifier....

In previous article about how to make a radio we have discussed a simple crystal radio receiver circuit. The schematic mentioned here is also a simple AM radio circuit but it is not using a crystal, it is using high gain preamplifier stage of transistor BC....

J201 JFET works best at 10 volts. The minimum current is 0. 5 mA. These are all ideal specifications. The specification spread of FETs is normally three to five times. I`ve personally seen a five-X variation in brand-name devices. The devices that I`ve....

Here is a high performance radio receiver antenna amplifier for the entire VHF broadcast and PMR band (100-175 MHz) which can be successfully built without....

Preamplifier circuit provides the proper loading for phono cartridges reluctance. This provides about 25 dB at 1 kHz gain (2.2 mV to 100 mV input output), features of S N/N ratio better than -70 dB (referenced to 10 mV input at 1 kHz) and has a dynamic range....

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The circuit uses two 2N3819 FET`s in cascode configuration. The lower FET operates in common source mode, while the upper FET, operates in common gate, realising full high frequency gain. The bottom FET is tunable allowing a peak for a particular station.....

The circuit requires an RF input which can be from a longwire or a loop antenna. The Preamplifier has a range from 550kHz (Medium Wave) up to 30 MHz in the SW band. The input Switch S1, applies voltage to a set of relays which switch in the appropriate....

The range of this FM transmitter is around 100 meters at 9V DC supply. The circuit comprises three stages. The first stage is a microphone preamplifier built around BC548 transistor. The next stage is a VHF oscillator wired around another BC548. (BC series....

The Audio Research Corporation LS22 Line Stage Preamplifier was chosen for this upgrade....

Preamplifier + tone control circuit based TDA1524A. Tone control circuit module is included in this preamplifier circuit, so you can connect the output channels directly to stereo power audio amplifier circuit. ThisRIAA stereo preamplifier uses only....

Phonographs are gradually becoming a rarity. Most of them have had to yield to more advanced systems, such as CD players and recorders or (portable) MiniDisc player/recorders. This trend is recognized by manufacturers of audio installations, which means that....

The circuit was based on a single operational amplifier integrated circuit that is made to produce a modular preamplifier which functions in the Class A o....

Circuit is based basically on quite well tested my simple microphone preamplifier. I have built one prototype of this circuit and it worked nicely. Soundblaster soundcard series (SB16, SB32, AWE32 and AWE64) have all a microphone input designed to be used....

Both transistors should be low noise types. In the original circuit, is used BC650C which is an ultra low noise device. These transistors are now hard to find but BC549C or BC109C are a good replacement. The circuit is self stabilizing and will set its....

The three circuits were based on the vacuum tube ECC83 designed to produce phono preamplifiers in compliance with the RIAA standards. Recording Industry A....

This is the another UHF-TV pre-amplifier circuit diagram which simpler than the previous UHF TV preamplifier. This circuit is based MPSH10. Alternatives that could be put to use to replace MPSH10 are BF180 and BCY90. The tuned circuit comprising the 15nH....

This is an UHF bandage TV antenna preamplifier circuit With 15dB accretion to body easily. It is formed based on BF180 UHF Transistor. The aboriginal date is an bandage canyon clarify complete by the C1, CV1, L1, L4, C7 and C3, the additional date is a....

This is a simple microphone preamplifier circuit which you can use between your microphone and stereo amplifier. This circuit amplifier microphone suitable for use with normal home stereo amplifier line/CD/aux/tape inputs. This mic preamp can take both....

The preamplifier is intended for use with dynamic (moving coil MC) microphones with an impedance up to 200 © and balanced terminals. It is a fairly simple design, which may also be considered as a single stage instrument amplifier based on a Type NE5534 op....

FM Booster, Active FM Antenna Amplifier This FM booster that can be used to listen to programmes from distant FM stations clearly. The circuit comprises a common-emitter tuned RF preamplifier wired around VHF/UHF transistor 2SC2570. (Only C....

The Muntz one-tube design can be considerably improved by adding an audio preamplifier stage. This will give improved sensitivity, and thus give full modulation with lower-level signal sources (such as some older CD players, ceramic phono cartridge, etc. ).....

This is a special low voltage version of my audio preamp. T1`s emitter voltage is biased close to half supply voltage (1. 5V) to allow for maximum output voltage swing. Both transistors are direct coupled and have closed loop feedback to aid temperature....

The antenna amplifier circuit has a part count of about 40, using the following active parts: 2 NPN transistors (BC548`s), 1 MOSFET (BF981), 2 Varicap diodes (KV1235), as well as a 6v2 zener-diode. there is and a 330uH (micro Henry) inductor / coil, which....

This circuit is shows how a low drift preamplifier can be added to improve the measurement resolution of a thermocouple. The preamp is powered from the reference regulator, and bridge feedback is used to bias the preamp input within its common mode range.....

Here is the circuit diagram of an excellent stereo preamplifier with tone control using the IC TDA1524 from Phillips. The IC requires very few external components, has very low noise and has a wide power supply voltage range. POTs R1 to R4 can be used for....

This Hi Fi stereo preamplifier ambit is congenital with TDA1054 IC from SGS. TDA1054 is a 16-pin DIL amalgamation and integrates 2 abstracted preamp circuits. It is a low babble preamp with little or no botheration in the architecture process. The aboriginal....

This class A preamplifier has been designed in a symmetrical structure. In the input differential stages we`ve used the dual transistors T1 and T2. Polarisation correction is essential because of the amplification differences and is assured with T12. P2....

As shown, the audio ascribe is a microphone, which uses 2 x 2N3904 as the microphone audio preamplifier. The audio/mic ascribe akin is adjustable by agency of a 5k preset / potentiometer. The ambit uses a Colpitts oscillator for abundance generation, which....

During my Digital Projects Lab, the professor recommended I find a way to include more circuit level work into my project. To fulfill this, I decided to build a nice preamplifier which wouldinclude an IR remote control to replace the one I had built....

This circuit consists of two identical intercom units. Each unit contains a power supply, microphone preamplifier, audio amplifier and a Push To Talk (PTT) relay circuit. Only 2 wires are required to connect the units together. Due to the low output....

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