DIY Module OTL Power Amplifier Circuit DIY Kit OTL Discrete Component Amplifier Electronic Production Suite

Description:
This is a DIY OTL Power Amplifier Kit parts. You should solder it by yourself. This circuit belongs to the OTL circuit teaching model, its maximum power is only 1W, driven by two complementary transistors S8550 and S8050.It can be used for exercise welding techniques, understanding the triode complementary OTL output type and how to adjust the static operating point, midpoint voltage, etc..

Features:
1>.High sensitivity;
2>.Low power;
3>.Wide operating voltage range;
4>.Low power consumption;
5>.DIY design;

Parameters:

Working principle:
1>.This circuit belongs to the OTL circuit teaching model, its maximum power is only 1W, driven by two complementary transistors S8550 and S8050;
2>.The working voltage of this kit is DC4-9V, the recommended voltage is 5V.

Instructions:
Step 1: Complete the installation in the normal way following installation manual and schematic.(Please request separately).
Step 2:Connect DC 4-9V voltage;
Step 3:Adjust potentiometers.
Step 4:Test and use.

Adjust Static Working Point:
1>.Turn VR1,VR2,VR3 counter clockwise to the end.Turn on power supply,The red cable of the multimeter connect TP1,Black cable of multimeter connect to GND.Adjust potentiometer VR2 to make sure the voltage is half of the power supply at TP1.(For example:The power supply voltage is 8V,So the voltage ofthe TP1 should be adjusted to 4V by VR2).
2>.Connect the ammeter to the power supply circuit,Then you will get the static current of the circuit.At this time,please adjust potentiometer VR3 to increase the current value of the circuit to 0.5mA.
When you input the audio signal at this time, you can have sound output(It need connect speaker by yourself).
3>.Optimum working voltage DC4-9V,Maximum output power is 1 watts!

Using Attention:
1>.Please make sure all components in right direction and right place.
2>.Please check whether pseudo/float welding.This is very important .
3>.The soldering iron can't touch the components for a long time, otherwise the components will be damaged because of the high temperature.
4>.It is recommended to use a stable power supply, otherwise it may interfere with the audio signal output.

Component list:

Note: You can finish installation by PCB silk screen and component listing.

Application:
1>.Electronic teaching
2>.Exercise welding skills
3>.Circuit application

Frequency asked questions:
1>.Why can't work?
Q :Please make sure all components in right direction and right place and check whether pseudo/float welding.This is very important.

Install tools you need preliminary preparation by yourself:
1>. Soldering iron;
2>. Multimeter;
3>. Solder wire;
4>. Iron stand;
5>. Diagonal cutting pliers;
6>. The screwdriver;
7>. Tweezers;
8>. Long nose pliers;
9>. Suction tin;
10>. Cleaning sponge;
11>. Screwdriver set.

Download installation manual and schematic:
 

Finished Product Picture:

Tested by ICStation's Outstanding Partner bzoli5706:

Learn More Details in the Video:
(The language in the video is English)

First we should say that ICStation doesn't accept any form of pay on delivery.Items used to be shipped after receiving the order info and payment.

1) Paypal Payment

PayPal is a secure and trusted payment processing service that allows you to shop online. PayPal can be used at icstation.com to purchase items by Credit Card (Visa, MasterCard, Discover, and American Express), Debit Card , or E-check (i.e. using your regular Bank Account). 

We are PayPal Verified 

2) West Union

We know that some of you do not have the Paypal account. 

Bank Transfer / Wire Transfer / T/T payment methods are accepted for orders which the total price is up to US$500. The bank will charge about US$60 for the transfer fee if we do the payment in these ways. 

For other payment method, please contact us at orders@icstation.com for more details.

1. Hongkong / Sinapore Airmail

(1) Due to the high risk of package lost recently, we have to stop using the free shipping way these days. Hope for your kind understanding! And the $3 is for tracking number and delivery insurance ^0^ Enjoy order from us. 

Free Shipping for all orders over $20 ^0^ (with free tracking number and delivery insurance fee)

(2) Shipping time 
Shipping time is 7-20 business days to most of countries; please view below table for exactly shipping time to your location. 

7-15 working days to: Most of Asia countries
10-16 working days to: USA , Canada , Australia , UK , Most of Europe countries
13-20 working days to: Germany , Russia
18-25 working days to: France , Italy , Spain , South Africa
20-45 working days to: Brazil , Most of South America countries

2. EMS/DHL/UPS Express

(1)Shipping Fee: Free for the order which meet the following requirements
Total price of the order >= 200USD or Total weight of the order >= 2.2KG

When the order meets to one of the above requirement, it will be shipped for FREE via EMS/DHL/UPS Express to below country. 
Asia: Japan , South Korea , Mongolia . Malaysia , Singapore , Thailand , Vietnam , Cambodia , Indonesia , Philippines 
Oceania: Australia , New Zealand , Papua New Guinea 
Europe& America: Belgium, Britain, Denmark, Finland, Greece, Ireland, Italy, Luxembourg, Malta, Norway, Portugal, Switzerland, Germany, Sweden, France, Spain, USA, Austria, Canada
Note: Shipping Fee to other countries, please contact orders@ICStation.com

(2) Shipping Time
Shipping time is 3-5 working day (about 1 week) to most of countries. 

Because the package would be returned to the sender if it had not been signed by the receiver in 2-3 day (DHL) or 1 week (EMS,) or 2 weeks (Registered Email), please pay attention to the arriving time of the package. 

Note:

1) APO and PO Box Addresses

3. Note
1) Delivery Time of mixed orders with items in different Shipping Status should be calculated using the longest estimate times listed. 
2) Chinese Holiday Reminder: During annual Chinese holidays, services from certain suppliers and carriers may be affected, and delivery for orders placed around the following times may be delayed by 3 - 7 days: Chinese New Year; Chinese National Day,etc. 
3) Once your order is shipped, you will receive an email notification from icstation.com
4) Track the order which with tracking number via below links: